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WO2000032773A9 - Compositions et methodes d'augmentation de la mineralisation de la substance osseuse - Google Patents

Compositions et methodes d'augmentation de la mineralisation de la substance osseuse

Info

Publication number
WO2000032773A9
WO2000032773A9 PCT/US1999/027990 US9927990W WO0032773A9 WO 2000032773 A9 WO2000032773 A9 WO 2000032773A9 US 9927990 W US9927990 W US 9927990W WO 0032773 A9 WO0032773 A9 WO 0032773A9
Authority
WO
WIPO (PCT)
Prior art keywords
protein
nucleic acid
tgf
acid molecule
sequence
Prior art date
Application number
PCT/US1999/027990
Other languages
English (en)
Other versions
WO2000032773A1 (fr
Inventor
Mary E Brunkow
David J Galas
Brian Kovacevich
John T Mulligan
Bryan W Paeper
Ness Jeffrey Van
David G Winkler
Original Assignee
Darwin Discovery Ltd
Mary E Brunkow
David J Galas
Brian Kovacevich
John T Mulligan
Bryan W Paeper
Ness Jeffrey Van
David G Winkler
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22332193&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2000032773(A9) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority to MX2013001685A priority Critical patent/MX343200B/es
Priority to EP99963986.7A priority patent/EP1133558B2/fr
Priority to ES99963986.7T priority patent/ES2272093T5/es
Priority to CA2352532A priority patent/CA2352532C/fr
Priority to BRPI9915679A priority patent/BRPI9915679B8/pt
Priority to HK02105515.3A priority patent/HK1044171B/zh
Priority to NZ512122A priority patent/NZ512122A/en
Priority to IL14326699A priority patent/IL143266A0/xx
Application filed by Darwin Discovery Ltd, Mary E Brunkow, David J Galas, Brian Kovacevich, John T Mulligan, Bryan W Paeper, Ness Jeffrey Van, David G Winkler filed Critical Darwin Discovery Ltd
Priority to JP2000585404A priority patent/JP4813660B2/ja
Priority to DE69933044.0T priority patent/DE69933044T3/de
Priority to DK99963986.7T priority patent/DK1133558T4/en
Priority to AU20313/00A priority patent/AU2031300C1/en
Priority to MXPA01005275A priority patent/MXPA01005275A/es
Priority to CN99815505.5A priority patent/CN1333828B/zh
Publication of WO2000032773A1 publication Critical patent/WO2000032773A1/fr
Priority to IL143266A priority patent/IL143266A/en
Publication of WO2000032773A9 publication Critical patent/WO2000032773A9/fr
Priority to CY20061101623T priority patent/CY1106260T1/el
Priority to IL210392A priority patent/IL210392A/en

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    • G—PHYSICS
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    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/74—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving hormones or other non-cytokine intercellular protein regulatory factors such as growth factors, including receptors to hormones and growth factors
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    • A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • A61K38/18—Growth factors; Growth regulators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A61K39/39533—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals
    • A61K39/3955—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals against proteinaceous materials, e.g. enzymes, hormones, lymphokines
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
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    • A61P19/10—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease for osteoporosis
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    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
    • C12Q1/6883—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material
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    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
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    • G01N33/84—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving inorganic compounds or pH
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/05—Animals comprising random inserted nucleic acids (transgenic)
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K2217/00—Genetically modified animals
    • A01K2217/07—Animals genetically altered by homologous recombination
    • A01K2217/075—Animals genetically altered by homologous recombination inducing loss of function, i.e. knock out
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
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    • C12N2799/00—Uses of viruses
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    • G01N2333/47—Assays involving proteins of known structure or function as defined in the subgroups
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    • G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
    • G01N2333/475—Assays involving growth factors
    • G01N2333/495—Transforming growth factor [TGF]
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    • G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
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    • G—PHYSICS
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    • G01N2500/02—Screening involving studying the effect of compounds C on the interaction between interacting molecules A and B (e.g. A = enzyme and B = substrate for A, or A = receptor and B = ligand for the receptor)
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    • G01N2500/20—Screening for compounds of potential therapeutic value cell-free systems

Definitions

  • the present invention relates generally to pharmaceutical products and methods and more specifically, to methods and compositions suitable for increasing the mineral content of bone
  • Such compositions and methods may be utilized to treat a wide variety of conditions including for example, osteopenia osteoporosis fractures and other disorders in which low bone mineral density are a hallmark of the disease
  • the first phase occurs in both men and women, and proceeds to attainment of a peak bone mass This first phase is achieved through linear growth of the endochondral growth plates and radial growth due to a rate of penosteal apposition
  • the second phase begins around age 30 for trabecuiar bone (flat bones such as the vertebrae and pelvis) and about age 40 for cortical bone (e g long bones found in the limbs) and continues to old age
  • This phase is characterized by slow bone loss, and occurs in both men and women
  • a third phase of bone loss also occurs, most likely due to postmenopausal estrogen deficiencies During this phase alone, women may lose an additional 10% of bone mass from the cortical bone and 25% from the trabecuiar compartment (see Riggs, supra)
  • Osteoporosis is a debilitating disease in humans characterized by marked decreases in skeletal bone mass and mineral density, structural deterioration of bone including degradation of bone microarchitecture and corresponding increases in bone fragility and susceptibility to fracture in afflicted individuals Osteoporosis in humans is preceded by clinical osteopenia (bone mineral density that is greater than one standard deviation but less than 2 5 standard deviations below the mean value for young adult bone), a condition found in approximately 25 million people in the United States Another 7-8 million patients in the United States have been diagnosed with clinical osteoporosis (defined as bone mineral content greater than 2 5 standard deviations below that of mature young adult bone) Osteoporosis is one of the most expensive diseases for the health care system, costing tens of billions of dollars annually in the United States In addition to health care-related costs, long-term residential care and lost working days add to the financial and social costs of this disease Worldwide approximately 75 million
  • osteoporosis has been defined as an increase in the risk of fracture due to decreased bone mass
  • none of the presently available treatments for skeletal disorders can substantially increase the bone density of adults
  • drugs are needed which could increase bone density in adults, particularly in the bones of the wrist, spinal column and hip that are at risk in osteopenia and osteoporosis
  • Current strategies for the prevention of osteoporosis may offer some benefit to individuals but cannot ensure resolution of the disease
  • These strategies include moderating physical activity (particularly in weight-bearing activities) with the onset of advanced age, including adequate calcium in the diet, and avoiding consumption of products containing alcohol or tobacco
  • all current therapeutic drugs and strategies are directed to reducing further loss of bone mass by inhibiting the process of bone absorption, a natural component of the bone remodeling process that occurs constitutively
  • estrogen is now being prescribed to retard bone loss There is, however, some controversy over whether there is any long term benefit to patients and whether there is any effect at all on patients over 75 years old Moreover, use of estrogen is believed to increase the risk of breast and endomet ⁇ al cancer
  • the present invention provides compositions and methods which can be utilized to increase bone mineralization, and thus may be utilized to treat a wide variety of conditions where it is desired to increase bone mass Further, the present invention provides other, related advantages
  • the present invention provides a novel class or family of TGF-beta binding-proteins, as well as assays for selecting compounds which increase bone mineral content and bone mineral density, compounds which increase bone mineral content and bone mineral density and methods for utilizing such compounds in the treatment or prevention of a wide variety of conditions
  • isolated nucleic acid molecules are provided, wherein said nucleic acid molecules are selected from the group consisting of (a) an isolated nucleic acid molecule comprising sequence ID Nos 1, 5, 7, 9, 1 1, 13, or, 15, or complementary sequence thereof, (b) an isolated nucleic acid molecule that specifically hybridizes to the nucleic acid molecule of (a) under conditions of high stringency, and (c) an isolated nucleic acid that encodes a TGF-beta binding-protein according to (a) or (b)
  • isolated nucleic acid molecules are provided based upon hybridization to only a portion of one of the above-identified sequences (e g , for (a) hybridization may be to a probe of at least 20, 25, 50, or 100 nucleotides selected from nucleotides 156 to 539 or 555 to 687 of Sequence ID No 1)
  • the necessary stringency to be utilized for hybridization may vary based upon the size of the probe For example, for
  • isolated nucleic acid molecules are provided which have homology to Sequence ID Nos 1, 5, 7, 9, 11 , 13, or 15, at a 50%, 60%, 75%, 80%, 90%, 95%, or 98% level of homology utilizing a Wilbur-Lipman algorithm
  • Representative examples of such isolated molecules include, for example, nucleic acid molecules which encode a protein comprising Sequence ID NOs.
  • isolated nucleic acid molecules are typically less than lOOkb in size, and, within certain embodiments, less than 50kb, 25kb, lOkb, or even 5kb in size
  • isolated nucleic acid molecules within other embodiments, do not exist in a "library" of other unrelated nucleic acid molecules (e.g., a subclone BAC such as described in GenBank Accession No AC003098 and EMB No AQ 171546)
  • isolated nucleic acid molecules can be found in libraries of related molecules (e.g., for shuffling, such as is described in U S Patent Nos 5,837,458, 5,830,721 , and 5,81 1,238)
  • isolated nucleic acid molecules as described herein do not include nucleic acid molecules which encode Dan, Cerberus
  • cloning vectors which contain the above-noted nucleic acid molecules, and expression vectors which comprise a promoter (e.g., a regulatory sequence) operably linked to one of the above-noted nucleic acid molecules
  • promoters include tissue- specific promoters, and viral - based promoters (e.g., CMV-based promoters such as CMV I-E, SV40 early promoter, and MuLV LTR)
  • Expression vectors may also be based upon, or derived from viruses (e.g., a "viral vector")
  • viral vectors include herpes simplex viral vectors, adenoviral vectors, adenovirus- associated viral vectors and retroviral vectors
  • host cells containing or comprising any of above-noted vectors (including for example, host cells of human, monkey, dog, rat, or mouse origin)
  • methods of producing TGF-beta binding-proteins comprising the step of culturing the aforementioned host cell containing vector under conditions and for a time sufficient to produce the TGF-beta binding protein
  • the protein produced by this method may be further purified (e.g., by column chromatography, affinity purification, and the like)
  • isolated proteins which are encoded by the above-noted nucleic acid molecules (e.g., Sequence ID NOs 2, 4, 6, 8, 10, 12, 14, or 16) may be readily produced given the disclosure of the subject application
  • fusion proteins comprising a first polypeptide segment comprising a TGF-beta binding-protein encoded by a nucleic acid molecule as described above, or a portion thereof of at least 10, 20, 30, 50, or 100 amino acids in length, and a second polypeptide segment comprising a non-TGF-beta binding-protein
  • the second polypeptide may be a tag suitable for purification or recognition (e.g., a polypeptide comprising multiple anionic amino acid residues - see U S Patent No 4,851,341), a marker (e.g. , green fluorescent protein, or alkaline phosphatase), or a toxic molecule (e.g., ricin)
  • antibodies are provided which are capable of specifically binding the above-described class of TGF-beta binding proteins (e.g., human BEER)
  • the antibody may be a polyclonal antibody, or a monoclonal antibody (e.g., of human or murine origin)
  • the antibody is a fragment of an antibody which retains the binding characteristics of a whole antibody (e.g., an F(ab') 2 , F(ab) 2 , Fab', Fab, or Fv fragment, or even a CDR)
  • hybridomas and other cells which are capable of producing or expressing the aforementioned antibodies
  • methods are provided detecting a TGF-beta binding protein, comprising the steps of incubating an antibody as described above under conditions and for a time sufficient to permit said antibody to bind to a TGF-beta binding protein, and detecting the binding
  • the antibody may be bound to a solid support to facilitate washing or separation, and/or labeled (e.g., with a marker selected from the group consisting of enzymes, fluorescent proteins, and radioisotopes)
  • isolated oligonucleotides are provided which hybridize to a nucleic acid molecule according to Sequence ID NOs 1, 3, 5, 7, 9, 1 1, 13, 15, 17, or 18 or the complement thereto, under conditions of high stringency
  • the oligonucleotide may be found in the sequence which encodes Sequence ID Nos 2, 4, 6, 8, 10, 12, 14, or 16
  • the oligonucleotide is at least 15, 20, 30, 50, or 100 nucleotides in length
  • the oligonucleotide is labeled with another molecule (e.g., an enzyme, fluorescent molecule, or radioisotope)
  • primers which are capable of specifically amplifying all or a portion of the above- mentioned nucleic acid molecules which encode TGF-beta binding-proteins
  • the term "specifically amplifying" should be understood to refer to primers which amplify the aforementioned TGF-beta binding-proteins, and
  • oligonucleotide which encodes a TGF-beta binding protein
  • methods for detecting a nucleic acid molecule which encodes a TGF-beta binding protein, comprising the steps of incubating an oligonucleotide as described above under conditions of high stringency, and detecting hybridization of said oligonucleotide
  • the oligonucleotide may be labeled and/or bound to a solid support.
  • ribozymes are provided which are capable of cleaving RNA which encodes one of the above-mentioned TGF- beta binding-proteins (e.g., Sequence ID NOs. 2, 6, 8, 10, 12, 14, or 16)
  • Such ribozymes may be composed of DNA, RNA (including 2'-O-methyl ribonucleic acids), nucleic acid analogs (e.g., nucleic acids having phosphorothioate linkages) or mixtures thereof
  • nucleic acid molecules e.g., DNA or cDNA
  • vectors which are capable of expressing or producing the ribozymes
  • vectors include plasmids, retrotransposons, cosmids, and viral-based vectors (e.g., viral vectors generated at least in part from a retrovirus, adenovirus, or, adeno-associated virus).
  • host cells e.g., human, dog, rat, or
  • ribozymes either synthetically, or by in vitro or in vivo transcription
  • the ribozymes so produced may be further purified and / or formulated into pharmaceutical compositions (e.g., the ribozyme or nucleic acid molecule encoding the ribozyme along with a pharmaceutically acceptable carrier or diluent)
  • the antisense oligonucleotides and antibodies or other selected molecules described herein may be formulated into pharmaceutical compositions
  • antisense oligonucleotides comprising a nucleic acid molecule which hybridizes to a nucleic acid molecule according to Sequence ID NOs. 1, 3, 5, 7, 9, 1 1, 13, or 15, or the complement thereto, and wherein said oligonucleotide inhibits the expression of TGF-beta binding protein as described herein (e g , human BEER)
  • the oligonucleotide is 15, 20, 25, 30, 35, 40, or 50 nucleotides in length
  • the oligonucleotide is less than 100, 75, or 60 nucleotides in length
  • the oligonucleotide may be comprised of one or more nucleic acid analogs, ribonucleic acids, or deoxyribonucleic acids
  • the oligonucleotide may be modified by one or more linkages, including for example, covalent linkage such as a phosphorothioate
  • methods for increasing bone mineralization, comprising introducing into a warm-blooded animal an effective amount of the ribozyme as described above
  • such methods comprise the step of introducing into a patient an effective amount of the nucleic acid molecule or vector as described herein which is capable of producing the desired ribozyme, under conditions favoring transcription of the nucleic acid molecule to produce the ribozyme
  • transgenic, non-human animals are provided within one embodiment a transgenic animal is provided whose germ cells and somatic cells contain a nucleic acid molecule encoding a TGF-beta bmding-protem as described above which is operably linked to a promoter effective for the expression of the gene, the gene being introduced into the animal, or an ancestor of the animal, at an embryonic stage, with the proviso that said animal is not a human
  • transgenic knockout animals comprising an animal whose germ cells and somatic cells comprise a disruption of at least one allele of an endogenous nucleic acid molecule which hybridizes to a nucleic acid molecule which encodes a TGF-binding protein as described herein, wherein the disruption prevents transcription of messenger RNA from said allele as compared to an animal without the disruption, with the proviso that the animal is not a human
  • the disruption is a nucleic acid deletion, substitution, or, insertion Within
  • kits for the detection of TGF-beta binding-protein gene expression, comprising a container that comprises a nucleic acid molecule, wherein the nucleic acid molecule is selected from the group consisting of (a) a nucleic acid molecule comprising the nucleotide sequence of SEQ ID NOs 1, 3, 5, 7, 9, 1 1, 13, or 15, (b) a nucleic acid molecule comprising the complement of the nucleotide sequence of (a), (c) a nucleic acid molecule that is a fragment of (a) or (b) of at least 15, 20 30, 50, 75, or, 100 nucleotides in length
  • kits for the detection of a TGF-beta binding-protein which comprise a container that comprise one of the TGF-beta binding protein antibodies described herein
  • methods for determining whether a selected molecule is capable of increasing bone mineral content comprising the steps of (a) mixing one or more candidate molecules with TGF-beta-binding-protem encoded by the nucleic acid molecule according to claim 1 and a selected member of the TGF-beta family of proteins (e g , BMP 5 or 6), (b) determining whether the candidate molecule alters the signaling of the TGF-beta family member, or alters the binding of the TGF-beta binding-protein to the TGF-beta family member
  • the molecule alters the ability of TGF- beta to function as a positive regulator of mesenchymal cell differentiation
  • the candidate molecule(s) may alter signaling or binding by, for example, either decreasing (e g , inhibiting), or increasing (e g , enhancing) signaling or binding
  • methods for determining whether a selected molecule is capable of increasing bone mineral content, comprising the step of determining whether a selected molecule inhibits the binding of TGF-beta binding-protein to bone, or an analogue thereof
  • Representative examples of bone or analogues thereof include hydroxyapatite and primary human bone samples obtained via biopsy
  • the selected molecule is contained within a mixture of molecules and the methods may further comprise the step of isolating one or more molecules which are functional within the assay
  • TGF-beta family of proteins is bound to a solid support and the binding of TGF-beta binding-protem is measured or TGF-beta binding- protein are bound to a solid support and the binding of TGF-beta proteins are measured
  • a wide variety of molecules may be assayed for their ability to increase bone mineral content by inhibiting the binding of the TGF-beta binding-protem to the TGF-beta family of proteins
  • Representative examples of such molecules include proteins or peptides, organic molecules, and nucleic acid molecules
  • methods are provided for increasing bone mineral content in a warm-blooded animal, comprising the step of administering to a warm-blooded animal a therapeutically effective amount of a molecule identified from the assays
  • molecules are provided (preferably isolated) which inhibit the binding of the TGF-beta binding-protein to the TGF-beta super-family of proteins
  • the molecules may be provided as a composition, and can further comprise an inhibitor of bone resorption
  • an inhibitor of bone resorption Representative examples of such inhibitors include calcitonin, estrogen, a bisphosphonate, a growth factor having anti-resorptive activity and tamoxifen
  • molecules which may be utilized in the afore-mentioned therapeutic contexts include, e.g , ribozymes, ribozyme genes, antisense molecules, and/or antibodies (e.g , humanized antibodies) Such molecules may depending upon their selection, used to alter, antagonize, or agonize the signalling or binding of a TGF-beta binding-protein family member as described herein
  • the above-described molecules and methods of treatment or prevention may be utilized on conditions such as osteoporosis, osteomalasia, periodontal disease, scurvy, Cushing's Disease, bone fracture and conditions due to limb immobilization and steroid usage
  • conditions such as osteoporosis, osteomalasia, periodontal disease, scurvy, Cushing's Disease, bone fracture and conditions due to limb immobilization and steroid usage
  • Figure 1 is a schematic illustration comparing the amino acid sequence of Human Dan, Human Gremlin, Human Cerberus and Human Beer Arrows indicate the Cysteine backbone
  • Figure 2 summarizes the results obtained from surveying a variety of human tissues for the expression of a TGF-beta binding-protein gene, specifically, the Human Beer gene A semi-quantitative Reverse Transcription-Polymerase Chain Reaction (RT-PCR) procedure was used to amplify a portion of the gene from first- strand cDNA synthesized from total RNA (described in more detail in EXAMPLE 2A)
  • Figure 3 summarizes the results obtained from RNA / ' // situ hybridization of mouse embryo sections, using a cRNA probe that is complementary to the mouse Beer transcript (described in more detail in EXAMPLE 2B)
  • Panel A is a transverse section of 10 5 dpc embryo
  • Panel B is a sagittal section of 12 5 dpc embryo
  • panels C and D are sagittal sections of 15 5
  • Figure 4 illustrates, by western blot analysis, the specificity of three different polyclonal antibodies for their respective antigens (described in more detail in EXAMPLE 4)
  • Figure 4A shows specific reactivity of an anti-H Beer antibody for H Beer antigen, but not H Dan or H Gremlin
  • Figure 4B shows reactivity of an anti-H Gremlin antibody for H Gremlin antigen, but not H Beer or H Dan
  • Figure 4C shows reactivity of an anti-H Dan antibody for H Dan, but not H Beer or H Gremlin
  • Figure 5 illustrates, by western blot analysis, the selectivity of the TGF- beta binding-protein, Beer, for BMP-5 and BMP-6, but not BMP-4 (described in more detail in EXAMPLE 5)
  • Figure 6 demonstrates that the ionic interaction between the TGF-beta binding-protein, Beer, and BMP-5 has a dissociation constant in the 15-30 nM range DETAILED DESCRIPTION OF THE INVENTION
  • TGF-beta should be understood to include any known or novel member of the TGF-beta super-family, which also includes bone morphogenic proteins (BMPs)
  • TGF-beta receptor should be understood to refer to the receptor specific for a particular member of the TGF-beta super-family (including bone morphogenic proteins (BMPs))
  • TGF-beta binding-protein should be understood to refer to a protein with specific binding affinity for a particular member or subset of members of the TGF-beta super-family (including bone morphogenic proteins (BMPs))
  • BMPs bone morphogenic proteins
  • Specific examples of TGF-beta binding-proteins include proteins encoded by Sequence ID Nos 1, 5, 7, 9, 1 1, 13, and 15
  • Inhibiting the "binding of the TGF-beta binding-protein to the TGF-beta family of proteins and bone morphogenic proteins (BMPs)" should be understood to refer to molecules which allow the activation of TGF-beta or bone morphogenic proteins (BMPs), or allow the binding of TGF-beta family members including bone morphogenic proteins (BMPs) to their respective receptors, by removing or preventing TGF-beta from binding to TGF-binding-protein Such inhibition may be accomplished, for example, by molecules which inhibit the binding of the TGF-beta binding-protein to specific members of theTGF-beta super-family
  • Vector refers to an assembly which is capable of directing the expression of desired protein
  • the vector must include transcriptional promoter elements which are operably linked to the gene(s) of interest
  • the vector may be composed of either deoxyribonucleic acids ("DNA”), ribonucleic acids ("RNA”), or a combination of the two (e.g., a DNA-RNA chimeric)
  • the vector may include a polyadenylation sequence, one or more restriction sites, as well as one or more selectable markers such as neomycin phosphotransferase or hygromycin phosphotransferase
  • other genetic elements such as an origin of replication, additional nucleic acid restriction sites, enhancers, sequences conferring inducibility of transcription, and selectable markers, may also be incorporated into the vectors described herein
  • isolated nucleic acid molecule is a nucleic acid molecule that is not integrated in the genomic DNA of an organism
  • a DNA molecule that encodes a TGF-binding protein that has been separated from the genomic DNA of a eukaryotic cell is an isolated DNA molecule
  • Another example of an isolated nucleic acid molecule is a chemically-synthesized nucleic acid molecule that is not integrated in the genome of an organism
  • the isolated nucleic acid molecule may be genomic DNA, cDNA, RNA, or composed at least in part of nucleic acid analogs
  • isolated polypeptide is a polypeptide that is essentially free from contaminating cellular components, such as carbohydrate, lipid, or other proteinaceous impurities associated with the polypeptide in nature
  • a particular protein preparation contains an isolated polypeptide if it appears nominally as a single band on SDS-PAGE gel with Coomassie Blue staining
  • isolated when referring to organic molecules means that the compounds are greater than 90 percent pure utilizing methods which are well known in the art (e g , NMR, melting point)
  • “Sclerosteosis” Sclerosteosis is a term that was applied by Hansen (1967) (Hansen, H G , Sklerosteose In Opitz, H , Schmid, F , Handbuch der Kinderheil ambience Berlin Springer (pub ) 6 1967 Pp 351-355) to a disorder similar to van Buchem hyperostosis corticalis generahsata but possibly differing in radiologic appearance of the bone changes and in the presence of asymmetric cutaneous syndactyly of the index and middle fingers in many cases The jaw has an unusually square appearance in this condition "Humanized antibodies” are recombinant proteins in which murine complementary determining regions of monoclonal antibodies have been transferred from heavy and light variable chains of the murine immunoglobulin into a human variable domain
  • an "antibody fragment” is a portion of an antibody such as F(ab') 2 , F(ab) 2 , Fab', Fab, and the like Regardless of structure, an antibody fragment binds with the same antigen that is recognized by the intact antibody
  • an anti-TGF-beta binding-protein monoclonal antibody fragment binds with an epitope of TGF-beta binding-protein
  • antibody fragment also includes any synthetic or genetically engineered protein that acts like an antibody by binding to a specific antigen to form a complex
  • antibody fragments include isolated fragments consisting of the light chain variable region, "Fv” fragments consisting of the variable regions of the heavy and light chains, recombinant single chain polypeptide molecules in which light and heavy variable regions are connected by a peptide linker (“sFv proteins”), and minimal recognition units consisting of the ammo acid residues that mimic the hyperva ⁇ able region
  • a “detectable label” is a molecule or atom which can be conjugated to an antibody moiety to produce a molecule useful for diagnosis
  • detectable labels include chelators, photoactive agents, radioisotopes, fluorescent agents, paramagnetic ions, enzymes, and other marker moieties
  • an ' immunoconiugate is a molecule comprising an anti-TGF-beta binding-protein antibody, or an antibody fragment, and a detectable label
  • An immunoconjugate has roughly the same, or only slightly reduced, ability to bind TGF-beta binding-protein after conjugation as before conjugation
  • TGF-beta Transforming Growth Factor-beta
  • TGF- bBP Transforming Growth Factor-beta binding-protein
  • BMP - ' bone morphogenic protein BMP - ' bone morphogenic protein
  • PCR - polymerase chain reaction
  • RT-PCR - PCR process in which RNA is first transcribed into DNA at the first step using reverse transc ⁇ ptase (RT), cDNA - any DNA made by copying an RNA sequence into DNA form
  • the present invention provides a novel class of TGF- beta binding-proteins, as well as methods and compositions for increasing bone mineral content in warm-blooded animals
  • the present inventions are based upon the unexpected discovery that a mutation in the gene which encodes a novel member of the TGF-beta binding-protein family results in a rare condition (sclerosteosis) characterized by bone mineral contents which are one- to four-fold higher than in normal individuals
  • assays which may be utilized to select molecules which inhibit the binding of the TGF- beta binding-protein to the TGF-beta family of proteins and bone morphogenic proteins (BMPs), and methods of utilizing such molecules for increasing the bone mineral content of warm-blooded animals (including for example, humans)
  • Sclerosteosis is now known to be an autosomal semi-dominant disorder which is characterized by widely disseminated sclerotic lesions of the bone in the adult
  • the condition is progressive Sclerosteosis also has a developmental aspect which is associated with syndactyly (two or more fingers are fused together)
  • the Sclerosteosis Syndrome is associated with large stature and many affected individuals attain a height of six feet or more
  • the bone mineral content of homozygotes can be 1 to 6 fold over normal individuals and bone mineral density can be 1 to 4 fold above normal values (e g , from unaffected siblings)
  • the Sclerosteosis Syndrome occurs primarily in Af ⁇ kaaners of Dutch descent in South Africa Approximately 1/140 individuals in the Af ⁇ kaaner population are carriers of the mutated gene (heterozygotes) The mutation shows 100% penetrance There are anecdotal reports of increased of bone mineral density in heterozygotes with no associated pathologies (syndactyly or skull overgrowth)
  • Sclerosteosis is characterized by the continual deposition of bone throughout the skeleton during the lifetime of the affected individuals In homozygotes the continual deposition of bone mineral leads to an overgrowth of bone in areas of the skeleton where there is an absence of mechanoreceptors (skull, jaw, cranium) In homozygotes with Sclerosteosis, the overgrowth of the bones of the skull leads to cranial compression and eventually to death due to excessive hydrostatic pressure on the brain stem In all other parts of the skeleton there is a generalized and diffuse sclerosis Cortical areas of the long bones are greatly thickened resulting in a substantial increase in bone strength Trabecuiar connections are increased in thickness which in turn increases the strength of the trabecuiar bone Sclerotic bones appear unusually opaque to x-rays
  • the rare genetic mutation that is responsible for the Sclerosteosis syndrome has been localized to the region of human chromosome 17 that encodes a novel member of the TGF-beta binding-protein family (one representative example of which is designated "H Beer")
  • H Beer TGF-beta binding-protein family
  • TGF-beta The Transforming Growth Factor-beta (TGF-beta) super-family contains a variety of growth factors that share common sequence elements and structural motifs (at both the secondary and tertiary levels) This protein family is known to exert a wide spectrum of biological responses on a large variety of cell types Many of them have important functions during the embryonal development in pattern formation and tissue specification, in adults they are involved, e.g., in wound healing and bone repair and bone remodeling, and in the modulation of the immune system
  • the super- family includes the Bone Morphogenic Proteins (BMPs), Activins, Inhibins, Growth and Differentiation Factors (GDFs), and Glial-Derived Neurotrophic Factors (GDNFs) Primary classification is established through general sequence features that bin a specific protein into a general sub-family Additional stratification within the sub-family is possible due to stricter sequence conservation between members of the smaller group In certain
  • TGF-beta signals by inducing the formation of hetero-oligomeric complexes of type I and type II receptors
  • the crystal structure of TGF-beta2 has been determined
  • the general fold of the TGF-beta2 monomer contains a stable, compact, cysteine knotlike structure formed by three disulphide bridges Dimerization, stabilized by one disulphide bridge, is antiparallel
  • TGF-beta family members initiate their cellular action by binding to receptors with intrinsic serine/threonine kinase activity
  • This receptor family consists of two subfamilies, denoted type 1 and type II receptors
  • Each member of the TGF-beta family binds to a characteristic combination of type I and type II receptors both of which are needed for signaling
  • TGF-beta first binds to the type II receptor (TbR-II), which occurs in the cell membrane in an oligome ⁇ c form with activated kinase
  • TbR-I type II receptor
  • BMPs bone morphogenic proteins
  • OPs osteogemc proteins
  • BMP 2-14, and osteogemc protein 1 and -2, OP-1 and OP-2 are members of the TGF-beta super-family
  • the striking evolutionary conservation between members the BMP/OP sub-family suggests that they are critical in the normal development and function of animals Moreover, the presence of multiple forms of BMPs/OPs raises an important question about the
  • BMP ANTAGONISM The BMP and Activin sub-families are subject to significant post- translational regulation An intricate extracellular control system exists, whereby a high affinity antagonist is synthesized and exported, and subsequently complexes selectively with BMPs or activins to disrupt their biological activity (W C Smith (1999) TIG 11(1) 3-6) A number of these natural antagonists have been identified, and based on sequence divergence appear to have evolved independently due to the lack of primary sequence conservation There has been no structural work to date on this class of proteins Studies of these antagonists has highlighted a distinct preference for interacting and neutralizing BMP-2 and BMP-4 Furthermore, the mechanism of inhibition seems to differ for the different antagonists (S Iemura et al (1998) Plot Natl Acad Sci USA 95 9337-9342)
  • the present invention provides a novel class of TGF- beta binding-proteins that possess a nearly identical cysteine (disulfide) scaffold when compared to Human DAN, Human Gremlin, and Human Cerberus, and SCGF (U S Patent No 5,780,263) but almost no homology at the nucleotide level (for background information, see generally Hsu, D R , Economides, A N , Wang, X , Eimon, P M , Harland, R M , "The Xenopus Dorsahzing Factor Gremlin Identifies a Novel Family of Secreted Proteins that Antagonize BMP Activities," M ⁇ leculai Cell 1 673-683, 1998)
  • One representative example of the novel class of TGF-beta binding- proteins is disclosed in Sequence ID Nos 1, 5, 9, 1 1, 13, and 15 Representative members of this class of binding proteins should also be understood to include variants of the TGF-beta binding-protein (e g , Sequence ID Nos 5
  • a variant TGF-beta binding-protein should have at least a 50% amino acid sequence identity to SEQ ID NOs 2, 6, 10, 12, 14 or 16 and preferably, greater than 60%, 65%, 70%, 75%, 80%, 85%, 90%, or 95% identity
  • TGF-beta binding-protein variants can be identified by having at least a 70% nucleotide sequence identity to SEQ ID NOs 1, 5, 9, 1 1, 13 or 15
  • the present invention contemplates TGF-beta binding-protein gene variants having greater than 75%, 80%, 85%, 90%, or 95% identity to SEQ ID NO 1 Regardless of the particular method used to identify a TGF-beta binding-protein variant gene or variant TGF-beta binding- protein, a variant TGF-beta binding-protein or a polypeptide encoded by a variant TGF-beta binding-protein gene can be functionally characterized by, for example, its ability to bind to and/or inhibit the signaling of a selected member of the TGF-
  • DNA molecules encoding a binding-protein gene can be obtained by screening a human cDNA or genomic library using polynucleotide probes based upon, for example, SEQ ID NO 1
  • RNA isolation techniques must provide a method for breaking cells, a means of inhibiting RNase-directed degradation of RNA, and a method of separating RNA from DNA, protein, and polysaccharide contaminants
  • total RNA can be isolated by freezing tissue in liquid nitrogen, grinding the frozen tissue with a mortar and pestle to lyse the cells, extracting the ground tissue with a solution of phenol/chloroform to remove proteins, and separating RNA from the remaining impurities by selective precipitation with lithium chloride (see, for example, Ausubel et al (eds ), Short Protocols in Molecular Biology, 3rd Edition, pages 4-1 to 4-6 (John Wiley & Sons 1995) ["Ausubel (1995)”], Wu et al , Methods in Gene Biotechnology, pages 33-41 (CRC Press, Inc 1997) ["Wu (1997)”])
  • total RNA can be isolated by extracting ground tissue with guanidinium isothiocyanate, extracting with organic solvents, and separating RNA from contaminants using differential centrifugation (see, for example, Ausubel (1995) at pages 4- 1 to 4-6, Wu (1997) at pages 33-41)
  • RNA In order to construct a cDNA library, poly(A) " RNA must be isolated from a total RNA preparation Poly(A) * RNA can be isolated from total RNA by using the standard technique of oligo(dT)-cellulose chromatography (see, for example, Ausubel (1995) at pages 4-11 to 4-12) Double-stranded cDNA molecules are synthesized from poly(A) * RNA using techniques well-known to those in the art (see, for example, Wu (1997) at pages 41 -46) Moreover, commercially available kits can be used to synthesize double- stranded cDNA molecules For example, such kits are available from Life Technologies, Inc (Gaithersburg, Maryland), CLONTECH Laboratories, Inc (Palo Alto, California), Promega Corporation (Madison, Wisconsin) and Stratagene Cloning Systems (La Jolla, California)
  • TGF-beta binding-protein cDNA clones can be modified by constructing a subtracted cDNA library which is enriched in TGF- binding-protein-specific cDNA molecules.
  • Techniques for constructing subtracted libraries are well-known to those of skill in the art (see, for example, Sargent, "Isolation of Differentially Expressed Genes," in Meth. Enzymol. J ' 52 423, 1987, and Wu et al (eds ), "Construction and Screening of Subtracted and Complete Expression cDNA Libraries," in Methods in Gene Biotechnology, pages 29-65 (CRC Press, Inc 1997))
  • a cDNA library can be prepared in a vector derived from bacteriophage, such as a ⁇ gtlO vector (see, for example, Huynh et al , "Constructing and Screening cDNA Libraries in ⁇ gtlO and ⁇ gtl l," in DNA Cloning- A Practical
  • double-stranded cDNA molecules can be inserted into a plasmid vector, such as a pBluesc ⁇ pt vector (Stratagene Cloning Systems, La Jolla, California), a LambdaGEM-4 (Promega Corp , Madison, Wisconsin) or other commercially available vectors Suitable cloning vectors also can be obtained from the American Type Culture Collection (Rockville, Maryland)
  • the cDNA library is inserted into a prokaryotic host, using standard techniques
  • a cDNA library can be introduced into competent E. coli DH5 cells, which can be obtained from Life Technologies, Inc (Gaithersburg, Maryland)
  • a human genomic DNA library can be prepared by means well-known in the art (see, for example, Ausubel (1995) at pages 5-1 to 5-6, Wu (1997) at pages 307-327) Genomic DNA can be isolated by lysing tissue with the detergent Sarkosyl, digesting the lysate with proteinase K, clearing insoluble debris from the lysate by centrifugation, precipitating nucleic acid from the lysate using isopropanol, and purifying resuspended DNA on a cesium chloride density gradient
  • DNA fragments that are suitable for the production of a genomic library can be obtained by the random shearing of genomic DNA or by the partial digestion of genomic DNA with restriction endonucleases
  • Genomic DNA fragments can be inserted into a vector, such as a bacteriophage or cosmid vector, in accordance with conventional techniques, such as the use of restriction enzyme digestion to provide appropriate termini, the use of alkaline phosphatase treatment to avoid undesirable joining of DNA molecules, and ligation with appropriate ligases Techniques for such manipulation are well-known in the art (see, for example, Ausubel (1995) at pages 5-1 to 5-6, Wu (1997) at pages 307-327)
  • Nucleic acid molecules that encode a TGF-beta binding-protein gene can also be obtained using the polymerase chain reaction (PCR) with oligonucleotide primers having nucleotide sequences that are based upon the nucleotide sequences of the human TGF-beta binding-protein gene, as described herein
  • PCR polymerase chain reaction
  • oligonucleotide primers having nucleotide sequences that are based upon the nucleotide sequences of the human TGF-beta binding-protein gene, as described herein
  • General methods for screening libraries with PCR are provided by, for example, Yu et al , "Use of the Polymerase Chain Reaction to Screen Phage Libraries," in Methods in Molecular Biology ⁇ , Vol. 15: PCR Protocols: Current Methods and Applications, White (ed ), pages 21 1 -215 (Humana Press, Inc 1993).
  • human genomic libraries can be obtained from commercial sources such as Research Genetics (Huntsville, AL) and the American Type Culture Collection (Rockville, Maryland).
  • a library containing cDNA or genomic clones can be screened with one or more polynucleotide probes based upon SEQ ID NO: l, using standard methods (see, for example, Ausubel (1995) at pages 6-1 to 6-1 1 ).
  • Anti-TGF-beta binding-protein antibodies produced as described below, can also be used to isolate DNA sequences that encode TGF-beta binding-protein genes from cDNA libraries.
  • the antibodies can be used to screen ⁇ gtl l expression libraries, or the antibodies can be used for immunoscreening following hybrid selection and translation (see, for example, Ausubel (1995) at pages 6-12 to 6- 16; Margolis et al., "Screening ⁇ expression libraries with antibody and protein probes," in DNA Cloning 2: Expression Systems, 2nd Edition, Glover et al. (eds.), pages 1-14 (Oxford University Press 1995)).
  • TGF-beta binding-protein cDNA or TGF-beta binding-protein genomic fragment can be determined using standard methods. Moreover, the identification of genomic fragments containing a TGF-beta binding- protein promoter or regulatory element can be achieved using well-established techniques, such as deletion analysis (see, generally, Ausubel (1995)).
  • a TGF-beta binding-protein gene can be obtained by synthesizing DNA molecules using mutually priming long oligonucleotides and the nucleotide sequences described herein (see, for example, Ausubel (1995) at pages 8-8 to 8-9).
  • Established techniques using the polymerase chain reaction provide the ability to synthesize DNA molecules at least two kilobases in length (Adang et al., Plant Molec. Biol. 27: 1 131, 1993; Bambot et al., PCR Methods and Applications 2:266, 1993; Dillon et al., "Use of the Polymerase Chain Reaction for the Rapid Construction of Synthetic Genes," in Methods in Molecular Biology, Vol.
  • Nucleic acid molecules encoding variant TGF-beta binding-protein genes can be obtained by screening various cDNA or genomic libraries with polynucleotide probes having nucleotide sequences based upon SEQ ID NO 1, 5, 9, 1 1, 13, or 15, using procedures described above TGF-beta bindmg-protein gene variants can also be constructed synthetically
  • a nucleic acid molecule can be devised that encodes a polypeptide having a conservative amino acid change, compared with the amino acid sequence of SEQ ID NOs 2, 6, 8, 10, 12, 14, or 16 That is, variants can be obtained that contain one or more amino acid substitutions of SEQ ID NOs 2, 6, 8, 10, 12, 14 or 16, in which an alkyl ammo acid is substituted for an alkyl amino acid in a TGF-beta binding-protein amino acid sequence, an aromatic amino acid is substituted for an aromatic amino acid in a TGF-beta binding-protem ammo acid sequence, a sulfur-containing amino acid is substituted for a sulfur-
  • a “conservative amino acid substitution” is illustrated by a substitution among amino acids within each of the following groups (1) glycine, alanine, valine, leucine, and isoleucine, (2) phenylalanine, tyrosine, and tryptophan, (3) serine and threonine, (4) aspartate and glutamate, (5) glutamine and asparagine, and (6) lysine, arginine and histidine In making such substitutions, it is important to, where possible, maintain the cysteine backbone outlined in Figure 1
  • Conservative amino acid changes in a TGF-beta binding-protein gene can be introduced by substituting nucleotides for the nucleotides recited in SEQ ID NO 1
  • Such "conservative amino acid” variants can be obtained, for example, by oligonucleotide-directed mutagenesis, linker-scanning mutagenesis, mutagenesis using the polymerase chain reaction, and the like (see Ausubel (1995) at pages 8-10 to 8-22, and McPherson (ed ), Directed Mutagenesis A Practical Approach (IRL Press 1991))
  • the functional ability of such variants can be determined using a standard method, such as the assay described herein
  • a variant TGF-beta binding-protein polypeptide can be identified by the ability to specifically bind anti-TGF-beta binding- protem antibodies
  • Routine deletion analyses of nucleic acid molecules can be performed to obtain "functional fragments" of a nucleic acid molecule that encodes a TGF-beta binding-protem polypeptide
  • DNA molecules having the nucleotide sequence of SEQ ID NO 1 can be digested with Ba/31 nuclease to obtain a series of nested deletions
  • the fragments are then inserted into expression vectors in proper reading frame, and the expressed polypeptides are isolated and tested for activity, or for the ability to bind anti-TGF-beta binding-protein antibodies
  • exonuclease digestion is to use oligonucleotide-directed mutagenesis to introduce deletions or stop codons to specify production of a desired fragment
  • particular fragments of a TGF-beta bmding-protem gene can be synthesized using the polymerase chain reaction
  • the present invention also contemplates functional fragments of a TGF- beta binding-protein gene that have conservative amino acid changes
  • a TGF-beta binding-protein variant gene can be identified on the basis of structure by determining the level of identity with nucleotide and amino acid sequences of SEQ ID NOs 1, 5, 9, 1 1, 13, or, 15 and 2, 6, 10, 12, 14, or 16, as discussed above
  • An alternative approach to identifying a variant gene on the basis of structure is to determine whether a nucleic acid molecule encoding a potential variant TGF-beta binding-protein gene can hybridize under stringent conditions to a nucleic acid molecule having the nucleotide sequence of SEQ ID Nos 1, 5, 9, 1 1, 13, or, 15, or a portion thereof of at least 15 or 20 nucleotides in length
  • a nucleic acid molecule encoding the polypeptide must be operably linked to regulatory sequences that control transcriptional expression in an expression vector and then introduced into a host cell
  • expression vectors can include translational regulatory sequences and a marker gene which is suitable for selection of cells that carry the expression vector
  • Expression vectors that are suitable for production of a foreign protein in eukaryotic cells typically contain (1) prokaryotic DNA elements coding for a bacterial replication origin and an antibiotic resistance marker to provide for the growth and selection of the expression vector in a bacterial host, (2) eukaryotic DNA elements that control initiation of transcription, such as a promoter, and (3) DNA elements that control the processing of transcripts, such as a transcription termination/polyadenylation sequence TGF-beta binding-proteins of the present invention are preferably expressed in mammalian cells Examples of mammalian host cells include African green monkey kidney cells (Vero, ATCC CRL 1587), human embryonic kidney cells (293-HEK, ATCC CRL 1573), baby hamster kidney cells (BHK-21 , ATCC CRL 8544), canine kidney cells (MDCK, ATCC CCL 34), Chinese hamster ovary cells (CHO-K1 , ATCC CCL61), rat pituitary cells (GH1 ; ATCC CCL82), HeLa S3 cells (
  • the transcriptional and translational regulatory signals may be derived from viral sources, such as adenovirus, bovine papilloma virus, simian virus, or the like, in which the regulatory signals are associated with a particular gene which has a high level of expression
  • viral sources such as adenovirus, bovine papilloma virus, simian virus, or the like, in which the regulatory signals are associated with a particular gene which has a high level of expression
  • Suitable transcriptional and translational regulatory sequences also can be obtained from mammalian genes, such as actin, collagen, myosin, and metallothionein genes
  • Transcriptional regulatory sequences include a promoter region sufficient to direct the initiation of RNA synthesis
  • Suitable eukaryotic promoters include the promoter of the mouse metallothionein I gene [Hamer et al , . Molec. Appl. Genet. 1 273, 1982], the TK promoter of Herpes virus [McKnight, Cell 31 355, 1982], the SV40 early promoter [Benoist et al , Nature 290 304, 1981], the Rons sarcoma virus promoter [Gorman et al , Proc. Nat 'I Acad. Sci.
  • a prokaryotic promoter such as the bacteriophage T3 RNA polymerase promoter, can be used to control TGF-beta binding-protein gene expression in mammalian cells if the prokaryotic promoter is regulated by a eukaryotic promoter (Zhou et al , Mol. Cell. Biol. 10 4529, 1990, Kaufman et al , Nucl. Acids Res. 19 4485, 1991)
  • TGF-beta binding-protein genes may also be expressed in bacterial, yeast, insect, or plant cells Suitable promoters that can be used to express TGF-beta binding- protein polypeptides in a prokaryotic host are well-known to those of skill in the art and include promoters capable of recognizing the T4, T3, Sp6 and T7 polymerases, the P R and P L promoters of bacteriophage lambda, the trp, recA, heat shock, lacU ⁇ r 5, tac, lpp- lacSpr, phoA, and lacZ promoters of E. coli, promoters of B.
  • suhtilis the promoters of the bacteriophages of Bacillus, Streptomyces promoters, the hit promoter of bacterio- phage lambda, the bla promoter of pBR322, and the CAT promoter of the chloram- phenicol acetyl transferase gene
  • Prokaryotic promoters have been reviewed by Glick, J. Ind. Microhiol. 1 277, 1987, Watson et al., Molecular Biology of the Gene, 4th Ed. (Benjamin Cummins 1987), and by Ausubel et al. (1995)
  • Preferred prokaryotic hosts include E. coli and Bacillus subtilus
  • Suitable strains of E. coli include BL21(DE3), BL21(DE3)pLysS, BL21(DE3)pLysE, DH1, DH4I, DH5, DH5I, DH5IF', DH5IMCR, DH10B, DH10B/p3, DH1 1 S, C600, HB101, JM101, JM105, JM109, JM1 10, K38, RR1, Y1088, Y1089, CSH18, ER1451, and ER1647 (see, for example, Brown (Ed ), Molecular Biology Lahfax (Academic Press 1991))
  • Suitable strains of Bacillus subtilus include BR151, YB886, MI 1 19, MI120, and B170 (see, for example, Hardy, "Bacillus Cloning Methods," in DNA Cloning: A Practical Approach, Glover (Ed ) (
  • Suitable expression vectors are based upon the Autogix ⁇ ha californica multiple nuclear polyhedrosis virus (AcMNPV), and contain well-known promoters such as Drosophila heat shock protein (hsp) 70 promoter, Autographa californica nuclear polyhedrosis virus immediate-early gene promoter (ie-1) and the delayed early 39K promoter, baculovirus pl O promoter, and the Drosophila metallothionein promoter.
  • hsp Drosophila heat shock protein
  • ie-1 Autographa californica nuclear polyhedrosis virus immediate-early gene promoter
  • baculovirus pl O promoter baculovirus pl O promoter
  • Drosophila metallothionein promoter Drosophila metallothionein promoter
  • Suitable insect host cells include cell lines derived from 1PLB-S -21 , a Spodoplera fingiperda pupal ovarian cell line, such as Sf9 (ATCC CRL 171 1 ), S 21AE, and S 21 (Invitrogen Corporation; San Diego, CA), as well as Drosophila Schneider-2 cells.
  • Sf9 ATCC CRL 171 1
  • S 21AE S 21AE
  • S 21 Invitrogen Corporation; San Diego, CA
  • Drosophila Schneider-2 cells Drosophila Schneider-2 cells.
  • Established techniques for producing recombinant proteins in baculovirus systems are provided by Bailey et al., "Manipulation of Baculovirus Vectors," in Methods in Molecular Biology, Volume ⁇ : Gene Transfer and Expression Protocols, Murray (ed.), pages 147-168 (The Humana Press, Inc.
  • Promoters for expression in yeast include promoters from GAL1 (galactose), PGK (phosphoglycerate kinase), ADH (alcohol dehydrogenase), AOXl (alcohol oxidase), HIS4 (histidinol dehydrogenase), and the like.
  • Many yeast cloning vectors have been designed and are readily available These vectors include Yip-based vectors, such as Ylp5, YRp vectors, such as YRpl 7, YEp vectors such as YEpl 3 and YCp vectors, such as YCp l 9.
  • Expression vectors can also be introduced into plant protoplasts, intact plant tissues, or isolated plant cells General methods of culturing plant tissues are provided, for example, by Miki et al., "Procedures for Introducing Foreign DNA into Plants," in Methods in Plant Molecular Biology and Biotechnology, Glick et al.
  • an expression vector can be introduced into host cells using a variety of standard techniques including calcium phosphate transfection, liposome-mediated transfection, microprojectile-mediated delivery, electroporation, and the like
  • the transfected cells are selected and propagated to provide recombinant host cells that comprise the expression vector stably integrated in the host cell genome
  • Techniques for introducing vectors into eukaryotic cells and techniques for selecting such stable transformants using a dominant selectable marker are described, for example, by Ausubel (1995) and by Murray (ed ), Gene Transfer and Expression Protocols (Humana Press 1991 )
  • Methods for introducing expression vectors into bacterial, yeast, insect, and plant cells are also provided by Ausubel (1995)
  • General methods for expressing and recovering foreign protein produced by a mammalian cell system is provided by, for example, Etcheverry, "Expression of Engineered Proteins in Mammalian Cell Culture," in Protein Engineering: Principles and Practice, Clel
  • TGF-beta binding-protein can be isolated by standard techniques, such as affinity chromatography, size exclusion chromatography, ion exchange chromatography, HPLC and the like Additional variations in TGF-beta binding-protein isolation and purification can be devised by those of skill in the art For example, anti-TGF-beta binding-protein antibodies, obtained as described below, can be used to isolate large quantities of protein by immunoaffinity purification
  • Antibodies to TGF-beta binding-protein can be obtained, for example, using the product of an expression vector as an antigen
  • Particularly useful anti-TGF- beta binding-protein antibodies "bind specifically" with TGF-beta binding-protein of Sequence ID Nos 2, 6, 10, 12, 14, or 16, but not to other TGF-beta binding-proteisn such as Dan, Cerberus, SCGF, or Gremlin
  • Antibodies of the present invention may be a polyclonal or, especially a monoclonal antibody
  • the antibody may belong to any immunoglobulin class, and may be for example an IgG, for example IgG,, IgG 2 , IgG 3 , IgG 4 , IgE, IgM, or IgA antibody It may be of animal, for example mammalian origin, and may be for example a murine, rat, human or other primate antibody Where desired the antibody may be an internalising antibody
  • Polyclonal antibodies to recombinant TGF-beta binding-protein can be prepared using methods well-known to those of skill in the art (see, for example, Green et al , "Production of Polyclonal Antisera,” in Immunochemical Pr otocols (Manson, ed ), pages 1-5 (Humana Press 1992), Williams et al , "Expression of foreign proteins in E coli using plasmid vectors and purification of specific polyclonal antibodies," in DNA Cloning 2 Expression Systems, 2nd Edition Glover et al (eds ), page 15 (Oxford University Press 1995))
  • polyclonal antibodies are typically raised in animals such as rats, mice, rabbits, goats, or sheep
  • an anti-TGF-beta binding-protein antibody of the present invention may also be derived from a subhuman primate antibody
  • General techniques for raising diagnostically and therapeutically useful antibodies in baboons may be found, for example, in Goldenberg et al , international patent
  • variable region domain may be of any size or amino acid composition and will generally comprise at least one hyperva ⁇ able amino acid sequence responsible for antigen binding embedded in a framework sequence
  • variable (V) region domain may be any suitable arrangement of immunoglobulin heavy (V H ) and/or light (V L ) chain variable domains
  • V H immunoglobulin heavy
  • V L light chain variable domains
  • the V region domain may be monome ⁇ c and be a V H or V L domain where these are capable of independently binding antigen with acceptable affinity
  • the V region domain may be dime ⁇ c and contain V H -V H , V H -V L , or V ⁇ -V L , dimers in which the V H and V L chains are non-covalently associated (abbreviated hereinafter as F )
  • the chains may be covalently coupled either directly, for example via a disulphide bond between the two variable domains, or through a linker, for example a peptide linker, to form a single chain domain (abbreviated herein
  • variable region domain may be any naturally occu ⁇ ng variable domain or an engineered version thereof
  • engineered version is meant a variable region domain which has been created using recombinant DNA engineering techniques
  • engineered versions include those created for example from natural antibody variable regions by insertions, deletions or changes in or to the amino acid sequences of the natural antibodies
  • Particular examples of this type include those engineered variable region domains containing at least one CDR and optionally one or more framework amino acids from one antibody and the remainder of the variable region domain from a second antibody
  • variable region domain may be covalently attached at a C -terminal amino acid to at least one other antibody domain or a fragment thereof
  • a V H domain is present in the variable region domain this may be linked to an immunoglobulin C H 1 domain or a fragment thereof
  • a V L domain may be linked to a C ⁇ domain or a fragment thereof
  • the antibody may be a Fab fragment wherein the antigen binding domain contains associated V H and V L domains covalently linked at their C-termini to a CHI and C ⁇ domain respectively
  • the CHI domain may be extended with further ammo acids, for example to provide a hinge region domain as found in a Fab' fragment, or to provide further domains, such as antibody CH2 and CH3 domains
  • an antibody fragment is a peptide coding for a single complementarity-determining region (CDR) CDR peptides ("minimal recognition units") can be obtained by constructing genes encoding the CDR of an antibody of interest Such genes are prepared, for example, by using the polymerase chain reaction to synthesize the variable region from RNA of antibody-producing cells (see, for example, Lar ⁇ ck et al , Methods A Companion to Methods in En ⁇ ymology 2 106, 1991 , Courtenay-Luck, "Genetic Manipulation of Monoclonal Antibodies," in Monoclonal Antibodies Production Engineering and Clinical Application, Ritter et al (eds ), page 166 (Cambridge University Press 1995), and Ward et al , "Genetic Manipulation and Expression of Antibodies," in Monoclonal Antibodies Principles and Applications, Birch et al , (eds ), page 137 (Wiley-Liss, Inc 1995))
  • Antibodies for use in the invention may in general be monoclonal (prepared by conventional immunisation and cell fusion procedures) or in the case of fragments, derived therefrom using any suitable standard chemical e g reduction or enzymatic cleavage and/or digestion techniques, for example by treatment with pepsin
  • monoclonal anti-TGF-beta binding-protein antibodies can be generated utilizing a variety of techniques Rodent monoclonal antibodies to specific antigens may be obtained by methods known to those skilled in the art (see, for example, Kohler et al , Nature 256 495, 1975, and Coligan et al (eds ), Current Protocols in Immunology, 1 2 5 1-2 6 7 (John Wiley & Sons 1991) ["Coligan”], Picksley et al , "Production of monoclonal antibodies against proteins expressed in E co f in DNA Cloning 2 Exp ess/on S) stems, 2nd Edition, Glover et al (eds ), page 93 (Oxford University Press 1995))
  • monoclonal antibodies can be obtained by injecting mice with a composition comprising a TGF-beta binding-protein gene product, verifying the presence of antibody production by removing a serum sample, removing the spleen to obtain B-lymphocytes, fusing the B-lymphocytes with myeloma cells to produce hybridomas, cloning the hybridomas, selecting positive clones which produce antibodies to the antigen, culturing the clones that produce antibodies to the antigen, and isolating the antibodies from the hybridoma cultures
  • an anti-TGF-beta binding-protem antibody of the present invention may be derived from a human monoclonal antibody
  • Human monoclonal antibodies are obtained from transgenic mice that have been engineered to produce specific human antibodies m response to antigenic challenge In this technique, elements of the human heavy and light chain locus are introduced into strains of mice derived from embryonic stem cell lines that contain targeted disruptions of the endogenous heavy chain and light chain loci The transgenic mice
  • Monoclonal antibodies can be isolated and purified from hybridoma cultures by a variety of well-established techniques Such isolation techniques include affinity chromatography with Protein-A Sepharose, size-exclusion chromatography, and ion-exchange chromatography (see, for example, Coligan at pages 2 7 1-2 7 12 and pages 2 9 1-2 9 3, Barnes et al , "Purification of Immunoglobulin G (IgG),” in Methods in Molecular Biology, Vol 10, pages 79-104 (The Humana Press, Inc 1992))
  • antibody fragments can be obtained, for example, by proteolytic hydrolysis of the antibody
  • Antibody fragments can be obtained by pepsin or papain digestion of whole antibodies by conventional methods
  • antibody fragments can be produced by enzymatic cleavage of antibodies with pepsin to provide a 5S fragment denoted F(ab') 2
  • This fragment can be further cleaved using a thiol reducing agent to produce 3 5S Fab' monovalent fragments
  • the cleavage reaction can be performed using a blocking group for the sulfhydryl groups that result from cleavage of disulfide linkages
  • an enzymatic cleavage using pepsin produces two monovalent Fab fragments and an Fc fragment directly
  • the antibody may be a recombinant or engineered antibody obtained by the use of recombinant DNA techniques involving the manipulation and re- expression of DNA encoding antibody variable and/or constant regions
  • DNA is known and/or is readily available from DNA libraries including for example phage- antibody libraries (see Chiswell, D J and McCafferty, J Tibtech J_0 80-84 (1992)) or where desired can be synthesised Standard molecular biology and/or chemistry procedures may be used to sequence and manipulate the DNA, for example, to introduce codons to create cysteine residues, to modify, add or delete other amino acids or domains as desired
  • one or more replicable expression vectors containing the DNA may be prepared and used to transform an appropriate cell line, e g a non-producing myeloma cell line, such as a mouse NSO line or a bacterial, e.g E.coli line, in which production of the antibody will occur
  • an appropriate cell line e g a non-producing myeloma cell line, such as a mouse NSO line or a bacterial, e.g E.coli line
  • the DNA sequence in each vector should include appropriate regulatory sequences, particularly a promoter and leader sequence operably linked to the variable domain sequence
  • Particular methods for producing antibodies in this way are generally well known and routinely used For example, basic molecular biology procedures are described by Maniatis et al (Molecular Cloning, Cold Spring Harbor Laboratory, New York, 1989), DNA sequencing can be performed as described in Sanger et al (PNAS 74, 5463, (1977)) and the Amersham International pic sequencing handbook, and site directed mutagenesis can be carried out according
  • the antibody according to the invention may have one or more effector or reporter molecules attached to it and the invention extends to such modified proteins
  • the effector or reporter molecules may be attached to the antibody through any available amino acid side-chain, terminal amino acid or, where present carbohydrate functional group located in the antibody, always provided of course that this does not adversely affect the binding properties and eventual usefulness of the molecule
  • Particular functional groups include, for example any free amino, imino, thiol, hydroxyl, carboxyl or aldehyde group Attachment of the antibody and the effector and/or reporter molecule(s) may be achieved via such groups and an appropriate functional group in the effector or reporter molecules
  • the linkage may be direct or indirect, through spacing or bridging groups
  • Effector molecules include, for example, antineoplastic agents, toxins (such as enzymatically active toxins of bacterial or plant origin and fragments thereof e g ricin and fragments thereof) biologically active proteins, for example enzymes, nucleic acids and fragments thereof, e.g DNA, RNA and fragments thereof, naturally occurring and synthetic polymers e g polysaccharides and polyalkylene polymers such as poly(ethylene glycol) and derivatives thereof, radionuclides, particularly radioiodide, and chelated metals
  • Suitable reporter groups include chelated metals, fluorescent compounds or compounds which may be detected by NMR or ESR spectroscopy
  • Particular antineoplastic agents include cytotoxic and cytostatic agents, for example alkylating agents, such as nitrogen mustards (e g. chlorambucil, melphalan, mechlorethamine, cyclophosphamide, or uracil mustard) and derivatives thereof, triethylenephosphoramide, triethylenethiophosphor-amide, busulphan, or cisplatin, antimetabolites, such as methotrexate, fluorouracil, floxuridine, cytarabine, mercaptopurine, thioguanine, fluoroacetic acid or fluorocitric acid, antibiotics, such as bleomycins (e g bleomycin sulphate), doxorubicin, daunorubicin, mitomycins (e g mitomycin C), actinomycins (e g dactinomycin) plicamycin, calichaemicin and derivatives thereof, or esperamicin and derivatives thereof, mitotic inhibitor
  • Chelated metals include chelates of di-or tripositive metals having a coordination number from 2 to 8 inclusive
  • Such metals include technetium (Tc), rhenium (Re), cobalt (Co), copper (Cu), gold (Au), silver (Ag), lead (Pb), bismuth (Bi), indium (In), gallium (Ga), yttrium (Y), terbium (Tb), gadolinium (Gd), and scandium (Sc)
  • the metal is preferably a radionuclide Particular radionuclides
  • the chelated metal may be for example one of the above types of metal chelated with any suitable polydentate chelating agent, for example acyclic or cyclic polyamines, polyethers, (e g crown ethers and derivatives thereof), polyamides, porphyrins, and carbocyclic derivatives
  • any suitable polydentate chelating agent for example acyclic or cyclic polyamines, polyethers, (e g crown ethers and derivatives thereof), polyamides, porphyrins, and carbocyclic derivatives
  • chelating agent in conjugates according to the invention, however, are acyclic and cyclic polyammes, especially polyaminocarboxylic acids, for example diethylenetriaminepentaacetic acid and derivatives thereof, and macrocyclic amines, e g cyclic tri-aza and tetra-aza derivatives (for example as described in International Patent Specification No WO 92/22583), and polyamides, especially desferrioxamine and derivatives thereof
  • a thiol group in the antibody when it is desired to use this may be achieved through reaction with a thiol reactive group present in the effector or reporter molecule
  • a thiol reactive group present in the effector or reporter molecule
  • examples of such groups include an a- halocarboxylic acid or ester, e g iodoacetamide, an imide, e g maleimide, a vinyl sulphone, or a disulphide
  • the present invention provides methods for selecting and/or isolating compounds which are capable of increasing bone density
  • methods for determining whether a selected molecule is capable of increasing bone mineral content, comprising the steps of (a) mixing a selected molecule with TGF-beta binding protein and a selected member of the TGF-beta family of proteins, (b) determining whether the selected molecule stimulates signaling by the TGF-beta family of proteins, or inhibits the binding of the TGF-beta binding protein to the TGF-beta family of proteins
  • the molecule enhances the ability of TGF-beta to function as a positive regulator of mesenchymal cell differentiation
  • methods are provided for determining whether a selected molecule is capable of increasing bone mineral content, comprising the steps of (a) exposing a selected molecule to cells which express TGF- beta binding-protein and (b) determining whether the expression (or activity) of TGF- beta bind
  • a family member of the TGF-beta super-family or a TGF- beta binding protein is first bound to a solid phase, followed by addition of a candidate molecule
  • the labeled family member of the TGF-beta super-family or a TGF-beta binding protein is then added to the assay, the solid phase washed, and the quantity of bound or labeled TGF-beta super-family member or TGF-beta binding protein on the solid support determined
  • Molecules which are suitable for use in increasing bone mineral content as described herein are those molecules which decrease the binding of TGF-beta binding protein to a member or members of the TGF-beta super-family in a statistically significant manner
  • assays suitable for use within the present invention should not be limited to the embodiments described within Examples 2 and 3 In particular, numerous parameters may be altered, such as by binding TGF-beta to a solid phase, or by elimination of a solid phase entirely
  • methods for determining whether a selected molecule is capable of increasing bone mineral content, comprising the steps of (a) exposing a selected molecule to cells which express TGF- beta and (b) determining whether the activity of TGF-beta from said exposed cells is altered, and therefrom determining whether the compound is capable of increasing bone mineral content
  • a wide variety of methods may be utilized to assess the changes of TGF-beta binding-protein expression due to a selected test compound
  • methods are provided for determining whether a selected molecule is capable of increasing bone mineral content, comprising the steps of (a) mixing a selected molecule with TGF-beta- binding-protein and a selected member of the TGF-beta family of proteins, (b) determining whether the selected molecule up-regulates the signaling of the TGF- beta family of proteins, or inhibits the binding of the TGF-beta binding-protein to the TGF-beta family of proteins
  • methods for determining whether a selected molecule is capable of increasing bone mineral content, comprising the step of determining whether a selected molecule inhibits the binding of TGF-beta binding-protein to bone, or an analogue thereof
  • bone or analogues thereof refers to hydroxyapatite, or a surface composed of a powdered form of bone, crushed bone or intact bone. Similar to the above described methods, a wide variety of methods may be utilized to assess the inhibition of TGF-beta binding-protein localization to bone matrix One such representative method is provided below in Example 7
  • the methods recited herein may refer to the analysis of an individual test molecule, that the present invention should not be so limited
  • the selected molecule may be contained within a mixture of compounds
  • the recited methods may further comprise the step of isolating a molecule which inhibits the binding of TGF-beta binding-protein to a TGF-beta family member
  • CANDIDATE MOLECULES A wide variety of molecules may be assayed for their ability to inhibit the binding of TGF-beta binding-protein to a TGF-beta family member Representative examples which are discussed in more detail below include organic molecules, proteins or peptides, and nucleic acid molecules Although it should be evident from the discussion below that the candidate molecules described herein may be utilized in the assays described herein, it should also be readily apparent that such molecules can also be utilized in a variety of diagnostic and therapeutic settins
  • Numerous organic molecules may be assayed for their ability to inhibit the binding of TGF-beta binding-protein to a TGF-beta family member
  • suitable organic molecules may be selected from either a chemical library, wherein chemicals are assayed individually, or from combinatorial chemical libraries where multiple compounds are assayed at once, then deconvoluted to determine and isolate the most active compounds
  • combinatorial chemical libraries include those described by Agrafiotis et al , "System and method of automatically generating chemical compounds with desired properties," U S Patent No 5,463,564, Armstrong, R W , "Synthesis of combinatorial arrays of organic compounds through the use of multiple component combinatorial array syntheses," WO 95/02566, Baldwin, J J et al , “Sulfonamide derivatives and their use,” WO 95/24186, Baldwin, J J et al , “Combinatorial dihydrobenzopyran library,” WO 95/30642, Brenner, S , “New kit for preparing combinatorial libraries,” WO 95/16918, Chenera, B et al , “Preparation of library of resin-bound aromatic carbocyclic compounds," WO 95/16712, Ellman, J A , “Solid phase and combinatorial synthesis of benzodiazepine compounds on a solid support," U.S Patent No 5,288,514, Felder, E.
  • a wide range of proteins and peptides may likewise be utilized as candidate molecules for inhibitors of the binding of TGF-beta binding-protein to a TGF-beta family member
  • Peptide molecules which are putative inhibitors of the binding of TGF- beta binding-protein to a TGF-beta family member may be obtained through the screening of combinatorial peptide libraries
  • Such libraries may either be prepared by one of skill in the art (see e.g., U S Patent Nos 4,528,266 and 4,359,535, and Patent Cooperation Treaty Publication Nos WO 92/15679, WO 92/15677, WO 90/07862, WO 90/02809, or purchased from commercially available sources (e.g , New England Biolabs Ph D TM Phage Display Peptide Library Kit)
  • antibodies which inhibit the binding of TGF-beta binding-protein to a TGF-beta family member may readily be prepared given the disclosure provided herein within the context of the present invention, antibodies are understood to include monoclonal antibodies, polyclonal antibodies, anti-idiotypic antibodies, antibody fragments (e.g., Fab, and F(ab')2, F v variable regions, or complementarity determining regions) As discussed above, antibodies are understood to be specific against TGF-beta binding-protein , or against a specific TGF-beta family member, if they bind with a K a of greater than or equal to 10 ⁇ M, preferably greater than or equal to 10 ⁇ M, and do not bind to other TGF-beta binding-proteins, or, bind with a K a of less than or equal to 10°M Furthermore, antibodies of the present invention should block or inhibit the binding of TGF-beta binding-protein to a TGF-beta family member The affinity of a monoclonal antibody or binding
  • polyclonal antibodies may be readily generated by one of ordinary skill in the art from a variety of warm-blooded animals such as horses, cows, various fowl, rabbits, mice, or rats
  • the TGF-beta binding-protein or unique peptide thereof of 13-20 amino acids preferably conjugated to keyhole limpet hemocyanin by cross-linking with glutaraldehyde
  • an adjuvant such as Freund's complete or incomplete adjuvant
  • samples of serum are collected and tested for reactivity to the protein or peptide
  • Particularly preferred polyclonal antisera will give a signal on one of these assays that is at least three times greater than background Once the titer of the animal has reached a plateau in terms of its reactivity to the protein, larger quantities of antisera may be readily obtained either by weekly bleedings, or by exsanguinating the animal
  • Monoclonal antibodies may also be readily generated using conventional techniques (see U S Patent Nos RE 32,01 1 , 4,902,614, 4,543,439, and 4,41 1,993 which are incorporated herein by reference, see also Monoclonal Antibodies, Hybridomas A New Dimension in Biological Analy ses, Plenum Press, Kennett, McKearn, and Bechtol (eds ), 1980, and Antibodies A Laboratory Manual, Harlow and Lane (eds ), Cold Spring Harbor Laboratory Press, 1988, which are also incorporated herein by reference)
  • a subject animal such as a rat or mouse is immunized with TGF-beta bindmg-protein or portion thereof as described above
  • the protein may be admixed with an adjuvant such as Freund's complete or incomplete adjuvant in order to increase the resultant immune response
  • an adjuvant such as Freund's complete or incomplete adjuvant
  • the animal may be reimmunized with another booster immunization, and tested for reactivity to the protein utilizing assays described above
  • organs which contain large numbers of B cells such as the spleen and lymph nodes are harvested
  • Cells which are obtained from the immunized animal may be immortalized by infection with a virus such as the Epstein-Barr virus (EBV) (see Glasky and Reading, Hybr idoma 5(4) 377-389, 1989)
  • EBV Epstein-Barr virus
  • the harvested spleen and/or lymph node cell suspensions are fused with a suitable myeloma cell in order to create a "hybridoma" which secretes monoclonal antibody
  • Suitable myeloma lines include, for example, ⁇ S-1 (ATCC No
  • the cells may be placed into culture plates containing a suitable medium, such as RPMI 1640, or DMEM (Dulbecco's Modified
  • FBS fetal bovine serum
  • the medium should contain a reagent which selectively allows for the growth of fused spleen and myeloma cells such as HAT (hypoxanthine, aminopte ⁇ n, and thymidine) (Sigma Chemical Co , St Louis, Missouri)
  • HAT hyperxanthine, aminopte ⁇ n, and thymidine
  • the resulting fused cells or hybridomas may be screened in order to determine the presence of antibodies which are reactive against TGF-beta bmding- protem (depending on the antigen used), and which block or inhibit the binding of TGF-beta binding-protem to a TGF-beta family member
  • assays may be utilized to determine the presence of antibodies which are reactive against the proteins of the present invention, including for example countercurrent immuno-electrophoresis, radioimmunoassays, radioimmunoprecipitations, enzyme-linked immuno-sorbent assays (ELISA), dot blot assays, western
  • portions or fragments, such as Fab and Fv fragments, of antibodies may also be constructed utilizing conventional enzymatic digestion or recombinant DNA techniques to incorporate the variable regions of a gene which encodes a specifically binding antibody
  • the genes which encode the variable region from a hybridoma producing a monoclonal antibody of interest are amplified using nucleotide primers for the variable region
  • These primers may be synthesized by one of ordinary skill in the art, or may be purchased from commercially available sources Stratagene (La Jolla, California) sells primers for mouse and human variable regions including, among others, primers for V IIa , V ⁇ , V Hc , N ⁇ d ' jL V L and C L regions
  • These primers may be utilized to amplify heavy or light chain variable regions, which may then be inserted into vectors such as ImmunoZAPTM H or ImmunoZAPTM L (Stratagene), respectively These vectors may then be introduced into E.
  • Suitable antibodies may be isolated or purified by many techniques well known to those of ordinary skill in the art (see Antibodies - A Laboratory Manual, Harlow and Lane (eds ), Cold Spring Harbor Laboratory Press, 1988) Suitable techniques include peptide or protein affinity columns, HPLC or RP-HPLC, purification on protein A or protein G columns, or any combination of these techniques
  • TGF-beta binding-protein As described herein and below in the Examples (e g , Examples 8 and 9), altered versions of TGF-beta binding-protein which compete with native TGF-beta binding-protein's ability to block the activity of a particular TGF-beta family member should lead to increased bone density
  • mutants of TGF-beta binding-protein which bind to the TGF-beta family member but do not inhibit the function of the TGF- beta family member would meet the criteria.
  • the mutant versions must effectively compete with the endogenous inhibitory functions of TGF-beta binding-protein
  • nucleotide sequence is deemed to be “substantially similar” if (a) the nucleotide sequence is derived from the coding region of the above-described genes and includes, for example, portions of the sequence or allelic variations of the sequences discussed above, or alternatively, encodes a molecule which inhibits the binding of TGF-beta binding-protein to a member of the TGF-beta family, (b) the nucleotide sequence is capable of hybridization to nucleotide sequences of the present invention under moderate, high or very high stringency (see Sambrook et al , Molecular Cloning: A Laboratory Manual, 2nd ed , Cold
  • the structure of the proteins encoded by the nucleic acid molecules described herein may be predicted from the primary translation products using the hydrophobicity plot function of, for example, P/C Gene or Intelligenetics Suite (Intelligenetics, Mountain View, California), or according to the methods described by Kyte and Doolittle (J. Mol. Biol. 75 " 105- 132, 1982)
  • Proteins of the present invention may be prepared in the form of acidic or basic salts, or in neutral form
  • individual amino acid residues may be modified by oxidation or reduction
  • various substitutions, deletions, or additions may be made to the amino acid or nucleic acid sequences, the net effect of which is to retain or further enhance or decrease the biological activity of the mutant or wild-type protein
  • nucleotide sequences encoding the same amino acid sequence
  • Other derivatives of the proteins disclosed herein include conjugates of the proteins along with other proteins or polypeptides This may be accomplished, for example, by the synthesis of N-terminal or C-terminal fusion proteins which may be added to facilitate purification or identification of proteins (see U S Patent No 4,851 ,341 , see also, Hopp et al , Bio/Technology 6 1204, 1988 )
  • fusion proteins such as Flag/TGF-beta binding-protein be constructed in order to assist in the
  • Proteins of the present invention may be constructed using a wide variety of techniques described herein Further, mutations may be introduced at particular loci by synthesizing oligonucleotides containing a mutant sequence, flanked by restriction sites enabling ligation to fragments of the native sequence Following ligation, the resulting reconstructed sequence encodes a derivative having the desired amino acid insertion, substitution, or deletion
  • oligonucleotide-directed site-specific (or segment specific) mutagenesis procedures may be employed to provide an altered gene having particular codons altered according to the substitution, deletion, or insertion required
  • Exemplary methods of making the alterations set forth above are disclosed by Walder et al (Gene 42 133, 1986), Bauer et al (Gene 3 " 73, 1985), Craik (Bio techniques, January 1985, 12-19), Smith et al (Genetic Engineering Principles and Methods, Plenum Press, 1981), and Sambrook et al (supra)
  • Deletion or truncation derivatives of proteins e g , a soluble extracellular portion
  • overhangs may be filled in, and the DNA rehgated
  • Exemplary methods of making the alterations set forth above are disclosed by Sambrook et al (Molecular Cloning A Laboratory Manual , 2d Ed , Cold Spring Harbor Laboratory Press, 1989
  • Nucleic acid molecules which encode proteins of the present invention may also be constructed utilizing techniques of PCR mutagenesis, chemical mutagenesis (Drmkwater and Klinedinst, PNAS 53 3402-3406, 1986), by forced nucleotide misincorporation (e g , Liao and Wise Gene 88 107-111 , 1990), or by use of randomly mutagenized oligonucleotides (Horwitz et al , Genome 3 1 12-1 17, 1989)
  • the present invention also provides for the manipulation and expression of the above described genes by culturing host cells containing a vector capable of expressing the above-described genes
  • vectors or vector constructs include either synthetic or cDNA-denved nucleic acid molecules encoding the desired protein, which are operably linked to suitable transcriptional or translational regulatory elements
  • suitable regulatory elements may be derived from a variety of sources, including bacterial, fungal, viral, mammalian, insect, or plant genes Selection of appropriate regulatory elements is dependent on the host cell chosen, and may be readily accomplished by one of ordinary skill in the art
  • Examples of regulatory elements include a transcriptional promoter and enhancer or RNA polymerase binding sequence, a transcriptional terminator, and a ribosomal binding sequence, including a translation initiation signal
  • Nucleic acid molecules that encode any of the proteins described above may be readily expressed by a wide variety of prokaryotic and eukaryotic host cells, including bacterial, mammalian, yeast or other fungi, viral, insect, or plant cells Methods for transforming or transfecting such cells to express foreign DNA are well known in the art (see, e g. , Itakura et al , U S Patent No 4,704,362, Hinnen et al , Proc. Natl. Acad. Sci.
  • Bacterial host cells suitable for carrying out the present invention include E. coli, B. subtilis, Salmonella typhimurium, and various species within the genera Pseudomonas, Streptomyces, and Staphylococcus, as well as many other bacterial species well known to one of ordinary skill in the art
  • Representative examples of bacterial host cells include DH5 ⁇ (Stratagene, LaJolla, California)
  • Bacterial expression vectors preferably comprise a promoter which functions in the host cell, one or more selectable phenotypic markers, and a bacterial origin of replication
  • Representative promoters include the ⁇ -lactamase (penicillinase) and lactose promoter system (see Chang et al , Nature 2"5.615, 1978), the T7 RNA polymerase promoter (Studier et al , Meth. Enzymol. 185 60-89, 1990), the lambda promoter (Elvin et al , Gene 8 " " 123-126, 1990), the trp promoter (Nichols and Yanofsky, Meth.
  • selectable markers include various antibiotic resistance markers such as the kanamycin or ampicillin resistance genes
  • selectable markers include various antibiotic resistance markers such as the kanamycin or ampicillin resistance genes
  • Many plasmids suitable for transforming host cells are well known in the art, including among others, pBR322 (see Bolivar et al , Gene 2 95, 1977), the pUC plasmids pUC18, pUC 19, pUC 1 18, pUC1 19 (see Messing, Meth.
  • Yeast and fungi host cells suitable for carrying out the present invention include, among others, Saccharomyces pombe, Saccharomyces cerevisiae, the genera Pichia or Kluyveromyces and various species of the genus Aspergillus (McKnight et al , U S Patent No 4,935,349)
  • Suitable expression vectors for yeast and fungi include, among others, YCp50 (ATCC No 37419) for yeast, and the amdS cloning vector pV3 (Turnbull, Bio/Technology " 169, 1989), YRp7 (Struhl et al , Proc. Natl. Acad. Sci.
  • promoters for use in yeast include promoters from yeast glycolytic genes (Hitzeman et al , J. Biol. Chem 255 12073-12080, 1980, Alber and Kawasaki, J. Mol. Appl. Genet. 7 419-434, 1982) or alcohol dehydrogenase genes (Young et al., in Genetic Engineering of Microorganisms for Chemicals, Hollaender et al (eds ), p 355, Plenum, New York, 1982, Ammerer, Meth. Enzymol.
  • Examples of useful promoters for fungi vectors include those derived from Aspergillus nidulans glycolytic genes, such as the adh3 promoter (McKnight et al , EMBO J. 4.2093-2099, 1985)
  • the expression units may also include a transcriptional terminator
  • An example of a suitable terminator is the adh3 terminator (McKnight et al., ibid , 1985)
  • the yeast vectors will generally include a selectable marker, which may be one of any number of genes that exhibit a dominant phenotype for which a phenotypic assay exists to enable transformants to be selected
  • selectable markers are those that complement host cell auxotrophy, provide antibiotic resistance or enable a cell to utilize specific carbon sources, and include leu2 (Broach et al., ibid.), ura3 (Botstein et al , Gene 8 17, 1979), or his3 (Struhl et al , ibid.)
  • Another suitable selectable marker is the cat gene, which confers chloramphenicol resistance on yeast cells Techniques for transforming fungi are well known in the literature, and have been described, for instance, by Beggs (ibid ), Hinnen et al (Proc.
  • the genotype of the host cell may contain a genetic defect that is complemented by the selectable marker present on the expression vector Choice of a particular host and selectable marker is well within the level of ordinary skill in the art Protocols for the transformation of yeast are also well known to those of ordinary skill in the art For example, transformation may be readily accomplished either by preparation of spheroplasts of yeast with DNA (.see Hinnen et al , PNAS USA “ 5 1929, 1978) or by treatment with alkaline salts such as LiCl (see Itoh et al , J. Bacteriology 153 163, 1983) Transformation of fungi may also be carried out using polyethylene glycol as described by Cullen et al (Bio/Technology 5 369, 1987)
  • Viral vectors include those which comprise a promoter that directs the expression of an isolated nucleic acid molecule that encodes a desired protein as described above
  • promoters such as MoMLV LTR, RSV LTR, Friend MuLV LTR, adenoviral promoter (Ohno et al , Science 265 781 -784, 1994), neomycin phosphotransferase promoter/enhancer, late parvovirus promoter (Koering et al , Hum. Gene Therap.
  • the promoter is a tissue-specific promoter (see e.g., WO 91/02805, EP 0,415,731 , and WO 90/07936)
  • tissue specific promoters include neural specific enolase promoter, platelet derived growth factor beta promoter, bone morphogenic protein promoter, human alphal-chimaerin promoter, synapsin I promoter and synapsin II promoter
  • other viral-specific promoters e.g., retroviral promoters (including those noted above, as well as others such as HIV promoters), hepatitis, herpes (e.g., EBV), and bacterial, fungal or parasitic (e.
  • Mammalian cells suitable for carrying out the present invention include, among others COS, CHO, SaOS, osteosarcomas, KS483, MG-63, primary osteoblasts, and human or mammalian bone marrow stroma
  • Mammalian expression vectors for use in carrying out the present invention will include a promoter capable of directing the transcription of a cloned gene or cDNA
  • Preferred promoters include viral promoters and cellular promoters.
  • Bone specific promoters include the bone sialo-protein and the promoter for osteocalcin
  • Viral promoters include the cytomegalovirus immediate early promoter (Boshart et al , Cell 41.521-530, 1985), cytomegalovirus immediate late promoter, SV40 promoter (Subramani et al , Mol. Cell. Biol. 1 854-864, 1981), MMTV LTR, RSV LTR, metallothionein- 1, adenovirus Ela Cellular promoters include the mouse metallothionein- 1 promoter (Palmiter et al , U S Patent No 4,579,821), a mouse V ⁇ promoter (Bergman et al , Proc. Natl.
  • RNA splice sites located downstream from the promoter and upstream from the DNA sequence encoding the peptide or protein of interest Preferred RNA splice sites may be obtained from adenovirus and/or immunoglobulin genes
  • a polyadenylation signal located downstream of the coding sequence of interest Suitable polyadenylation signals include the early or late polyadenylation signals from SV40 (Kaufman and Sharp, ibid.), the polyadenylation signal from the Adenovirus 5 E1B region and the human growth hormone gene terminator (DeNot
  • the expression vectors may include a noncoding viral leader sequence, such as the Adenovirus 2 tripartite leader, located between the promoter and the RNA splice sites
  • Preferred vectors may also include enhancer sequences, such as the SV40 enhancer
  • Expression vectors may also include sequences encoding the adenovirus VA RNAs Suitable expression vectors can be obtained from commercial sources (e.g., Stratagene, La Jolla, California)
  • Vector constructs comprising cloned DNA sequences can be introduced into cultured mammalian cells by, for example, calcium phosphate-mediated transfection (Wigler et al , Cell 14 125, 1978, Corsaro and Pearson, Somatic Cell Genetics " .603, 1981 , Graham and Van der Eb, Virology 52 456, 1973), electroporation (Neumann et al , EMBO J.
  • a selectable marker is generally introduced into the cells along with the gene or cDNA of interest
  • Preferred selectable markers for use in cultured mammalian cells include genes that confer resistance to drugs, such as neomycin, hygromycin, and methotrexate
  • the selectable marker may be an amplifiable selectable marker
  • Preferred amplifiable selectable markers are the DHFR gene and the neomycin resistance gene Selectable markers are reviewed by Thilly (Mammalian Cell Technology, Butterworth Publishers, Stoneham, Massachusetts, which is incorporated herein by reference)
  • Mammalian cells containing a suitable vector are allowed to grow for a period of time, typically 1 -2 days, to begin expressing the DNA sequence(s) of interest
  • Drug selection is then applied to select for growth of cells that are expressing the selectable marker in a stable fashion
  • the drug concentration may be increased in a stepwise manner to select for increased copy number of the cloned sequences, thereby increasing expression levels
  • Cells expressing the introduced sequences are selected and screened for production of the protein of interest in the desired form or at the desired level Cells that satisfy these criteria can then be cloned and scaled up for production
  • Protocols for the transfection of mammalian cells are well known to those of ordinary skill in the art Representative methods include calcium phosphate mediated transfection, electroporation, lipofection, retroviral, adenoviral and protoplast fusion-mediated transfection (see Sambrook et al , supra) Naked vector constructs can also be taken up by muscular cells or other suitable cells subsequent to injection into the muscle of a mammal (or other animals)
  • proteins of the present invention may be expressed in a transgenic animal whose germ cells and somatic cells contain a gene which encodes the desired protein and which is operably linked to a promoter effective for the expression of the gene
  • transgenic animals may be prepared that lack the desired gene (e.g , "knock-out" mice)
  • Such transgenics may be prepared in a variety of non-human animals, including mice, rats, rabbits, sheep, dogs, goats and pigs (see Hammer et al , Nature 315 680-683, 1985, Palmiter et al , Science 222 809-814, 1983, Brinster et al , Proc.
  • an expression vector including a nucleic acid molecule to be expressed together with appropriately positioned expression control sequences, is introduced into pronuclei of fertilized eggs, for example, by microinjection.
  • the introduced DNA be incorporated into the germ line of the animal so that it is passed on to the animal's progeny Tissue-specific expression may be achieved through the use of a tissue-specific promoter, or through the use of an inducible promoter, such as the metallothionein gene promoter (Palmiter et al , 1983, ibid), which allows regulated expression of the transgene
  • Proteins can be isolated by among other methods, culturing suitable host and vector systems to produce the recombinant translation products of the present invention
  • Supernatants from such cell lines, or protein inclusions or whole cells where the protein is not excreted into the supernatant can then be treated by a variety of purification procedures in order to isolate the desired proteins
  • the supernatant may be first concentrated using commercially available protein concentration filters, such as an Amicon or Milhpore Pelhcon ultrafiltration unit Following concentration, the concentrate may be applied to a suitable purification matrix such as, for example, an anti-protein antibody bound to a suitable support
  • a on or cation exchange resins may be employed in order to purify the protein
  • one or more reverse-phase high performance liquid chromatography (RP-FIPLC) steps may be employed to further purify the protein
  • RP-FIPLC reverse-phase high performance liquid chromatography
  • a protein is deemed to be "isolated" within the context of the present invention if no other (undesired) protein is detected pursuant to SDS-PAGE analysis followed by Coomassie blue staining
  • the desired protein can be isolated such that no other (undesired) protein is detected pursuant to SDS- PAGE analysis followed by silver staining
  • nucleic acid molecules are provided which are capable of inhibiting TGF-beta binding-protein binding to a member of the TGF-beta family
  • antisense oligonucleotide molecules are provided which specifically inhibit expression of TGF- beta binding-protein nucleic acid sequences (see generally, Hirashima et al in Molecular Biology of RNA New Perspectives (M Inouye and B S Dudock, eds , 1987 Academic Press, San Diego, p 401), Oligonucleotides Antisense Inhibitors of Gene Expression (J S Cohen, ed , 1989 MacMillan Press, London), Stein and Cheng, Science 261 1004-1012, 1993, WO 95/10607, U S Patent No 5,359,051, WO 92/06693, and EP-A2-612844) Briefly, such molecules are constructed such that they are complementary to, and able to form Watson-Crick base pairs with, a region of transcribed TGF-
  • ribozymes are provided which are capable of inhibiting the TGF-beta binding-protein binding to a member of the TGF- beta family
  • ribozymes are intended to include RNA molecules that contain anti-sense sequences for specific recognition, and an RNA-cleaving enzymatic activity The catalytic strand cleaves a specific site in a target RNA at greater than stoichiometric concentration
  • ribozymes may be utilized within the context of the present invention, including for example, the hammerhead ribozyme (for example, as described by Forster and Symons, Cell 48 21 1-220, 1987, Haseloff and Gerlach, Nature 328 596-600, 1988, Walbot and Bruenmg, Nature 334 196, 1988, Haseloff and Gerlach, Nature 334 585, 1988), the hairpin ribozyme (for example, as described by Haseloff et al , U S Patent No 5,
  • the gene product or any of the candidate molecules described above and below, may be labeled with a variety of compounds, including for example, fluorescent molecules, toxins, and radionuclides
  • fluorescent molecules include fluorescein, Phycobi/i proteins, such as phycoerythrin, rhodamine, Texas red and luciferase
  • toxins include ricin, abrin diphtheria toxin, cholera toxin, gelonin, pokeweed antiviral protein, tritin, Shigella toxin, and Pseudomonas exotoxin
  • radionuclides include Cu-64, Ga-67, Ga-68, Zr-89, Ru-97, Tc-99m, Rh-105, Pd-109, In-I l l , 1-123, 1-125, I- 131, Re-186, Re-188, Au-198, Au-199, Pb-203, At-21 1, Pb-212 and Bi-212
  • fluorescent molecules include fluorescein
  • the present invention also provides a variety of pharmaceutical compositions, comprising one of the above-described molecules which inhibits the TGF-beta binding-protein binding to a member of the TGF-beta family along with a pharmaceutically or physiologically acceptable carrier, excipients or diluents
  • a pharmaceutically or physiologically acceptable carrier such as a pharmaceutically or physiologically acceptable carrier, excipients or diluents
  • such carriers should be nontoxic to recipients at the dosages and concentrations employed
  • the preparation of such compositions entails combining the therapeutic agent with buffers, antioxidants such as ascorbic acid, low molecular weight (less than about 10 residues) polypeptides, proteins, amino acids, carbohydrates including glucose, sucrose or dextrins, chelating agents such as EDTA, glutathione and other stabilizers and excipients
  • Neutral buffered saline or saline mixed with nonspecific serum albumin are exemplary appropriate diluents
  • the present invention also provides methods for increasing the mineral content and mineral density of bone
  • numerous conditions result in the loss of bone mineral content, including for example, disease, genetic predisposition, accidents which result in the lack of use of bone (e.g., due to fracture), therapeutics which effect bone resorption, or which kill bone forming cells and normal aging
  • the molecules described herein which inhibit the TGF-beta binding-protein binding to a TGF-beta family member such conditions may be treated or prevented
  • bone mineral content has been increased, if bone mineral content has been increased in a statistically significant manner (e g , greater than one-half standard deviation), at a selected site
  • a statistically significant manner e g , greater than one-half standard deviation
  • methods for increasing bone density, comprising the step of introducing into cells which home to bone a vector which directs the expression of a molecule which inhibits the TGF-beta binding-protein binding to a member of the TGF-beta family, and administering the vector containing cells to a warm-blooded animal
  • cells which home to bone may be obtained directly from the bone of patients (e.g., cells obtained from the bone marrow such as CD34+, osteoblasts, osteocytes, and the like), from peripheral blood, or from cultures
  • TGF-beta binding-protein binding to a member of the TGF-beta family is introduced into the cells
  • suitable vectors include viral vectors such as herpes viral vectors (e.g., U S Patent No 5,288,641 ), adenoviral vectors (e.g , WO 94/26914, WO 93/9191, Rolls et al , PNAS 97( 1) 215-219, 1994, Kass-Eisler et al , PNAS 90(24) 1 1498-502, 1993, Guzman et al , Circulation 55(6) 2838-48, 1993, Guzman et al , Cir. Res.
  • viral vectors such as herpes viral vectors (e.g., U S Patent No 5,288,641 ), adenoviral vectors (e.g , WO 94/26914, WO 93/9191, Rolls et al , PNAS 97( 1) 215-219, 1994, Kass-Eis
  • Viral vectors may likewise be constructed which contain a mixture of different elements (e.g., promoters, envelope sequences and the like) from different viruses, or non-viral sources within various embodiments, either the viral vector itself, or a viral particle which contains the viral vector may be utilized in the methods and compositions described below
  • nucleic acid molecules which encode a molecule which inhibits the TGF-beta binding-protein binding to a member of the TGF-beta family themselves may be administered by a variety of techniques, including, for example, administration of asialoosomucoid (ASOR) conjugated with poly-L-lysine DNA complexes (Cristano et al , PNAS 92122-92126, 1993), DNA linked to killed adenovirus (Curiel et al , Hum. Gene Ther.
  • ASOR asialoosomucoid
  • molecules which may be expressed by the vectors of present invention include ribozymes and antisense molecules, each of which are discussed in more detail above
  • Determination of increased bone mineral content may be determined directly through the use of X-rays (e.g., Dual Energy X-ray Absorptometry or "DEXA”), or by inference through bone turnover markers (osteoblast specific alkaline phosphatase, osteocalcin, type 1 procollagen C propeptide (PICP), and total alkaline phosphatase, see Cornier, C , Curr. Opin. in Rhe .
  • X-rays e.g., Dual Energy X-ray Absorptometry or "DEXA”
  • bone turnover markers osteoblast specific alkaline phosphatase, osteocalcin, type 1 procollagen C propeptide (PICP), and total alkaline phosphatase, see Cornier, C , Curr. Opin. in Rhe .
  • the amount of bone mass may also be calculated from body weights, or utilizing other methods (see Guinness-Hey, Metab. Bone Dis. and Re I. Res. 5 177-181, 1984)
  • compositions may be administered by a variety of techniques, as noted above.
  • RNA samples were prepared from the following total RNA samples using a commercially available kit ("Superscript Preamplification System for First- Strand cDNA Synthesis", Life Technologies, Rockville, MD) human brain, human liver, human spleen, human thymus, human placenta, human skeletal muscle, human thyroid, human pituitary, human osteoblast (NHOst from Clonetics Corp , San Diego, CA), human osteosarcoma cell line (Saos-2, ATCC# HTB-85), human bone, human bone marrow, human cartilage, vervet monkey bone, saccharomyces cerevisiae, and human peripheral blood monocytes All RNA samples were purchased from a commercial source (Clontech, Palo Alto, CA), except the following which were prepared in-house. human osteoblast, human osteosarcoma cell line,
  • PCR was performed on these samples, and additionally on a human genomic sample as a control
  • the sense Beer oligonucleotide primer had the sequence 5'-CCGGAGCTGGAGAACAACAAG-3' (SEQ ID NO 19)
  • the antisense Beer oligonucleotide primer had the sequence 5'-GCACTGGCCGGAGCACACC-3' (SEQ ID NO 20)
  • PCR was performed using primers for the human beta-actm gene, as a control
  • the sense beta-actin oligonucleotide primer had the sequence 5 '- AGGCCAACCGCGAGAAGATGA CC -3 ' (SEQ ID NO 21)
  • the antisense beta-actm oligonucleotide primer had the sequence 5'-GAAGT CCAGGGCGACGTAGCA-3 ' (SEQ ID NO 22)
  • PCR was performed using standard conditions in 25 ul reactions, with an annealing temperature of 61 degrees Celsius Thirty-two cycles of PCR were performed with
  • the full length mouse Beer cDNA (Sequence ID No 1 1 ) was cloned into the pCR2 1 vector (Invitrogen, Carlsbad, CA) in the antisense and sense direction using the manufacturer's protocol ⁇ S-alpha-GTP-labeled cRNA sense and antisense transcripts were synthesized using in-vitro transcription reagents supplied by Ambion, Inc (Austin, TX) In-situ hybridization was performed according to the protocols of Lyons et al (J. Cell Biol. 777 2427-2436, 1990)
  • the mouse Beer cRNA probe detected a specific message expressed in the neural tube, limb buds, blood vessels and ossifying cartilages of developing mouse embryos
  • Panel A in Figure 3 shows expression in the apical ectodermal ridge (aer) of the limb (1) bud, blood vessels (bv) and the neural tube (nt)
  • Panel B shows expression in the 4 th ventricle of the brain (4)
  • Panel C shows expression in the mandible (ma) cervical vertebrae (cv), occipital bone (oc), palate (pa) and a blood vessel (bv)
  • Panel D shows expression in the ribs (r) and a heart valve (va)
  • Panel A is a transverse section of 10 5 dpc embryo
  • the DNA sequence encoding the full length human Beer protein was amplified using the following PCR oligonucleotide primers
  • the 5' oligonucleotide primer had the sequence 5'-AAGCTTGGTACCATGCAGCTCCCAC-3' (SEQ ID NO 23) and contained a Hindlll restriction enzyme site (in bold) followed by 19 nucleotides of the Beer gene starting 6 base pairs prior to the presumed amino terminal start codon (ATG)
  • the 3 ' oligonucleotide primer had the sequence 5'- AAGCTTCTACTTGTCATCGTCGTCCT TGTAGTCGTAGGCGTTCTCCAGCT-3 ' (SEQ ID NO 24) and contained a Hindlll restriction enzyme site (in bold) followed by a reverse complement stop codon (CTA) followed by the reverse complement of the FLAG epitope (underlined, Sigma-Aldrich Co , St Louis, MO) flanked by the reverse complement of nucleotides coding for
  • DH10B E. coli were transformed and plated on LB, 100 ⁇ g/ml ampicillin plates Colonies bearing the desired recombinant in the proper orientation were identified by a PCR-based screen, using a 5' primer corresponding to the T7 promoter/priming site in pcDNA3.1 and a 3' primer with the sequence 5'- GCACTGGCCGGAGCACACC-3' (SEQ ID NO.25) that corresponds to the reverse complement of internal BEER sequence The sequence of the cloned fragment was confirmed by DNA sequencing
  • COS-1 cells (ATCC# CRL- 1650) were used for transfection 50 ⁇ g of the expression plasmid pcDNA-Beer-Flag was transfected using a commercially available kit following protocols supplied by the manufacturer ("DEAE-Dextran Transfection Kit", Sigma Chemical Co., St. Louis, MO). The final media following transfection was DMEM (Life Technologies, Rockville, MD) containing 0 1% Fetal Bovine Serum.
  • recombinant BEER was analyzed by SDS-PAGE and Western Blot using anti-FLAG M2 monoclonal antibody (Sigma-Aldrich Co , St Louis, MO) Purification of recombinant BEER protein was performed using an anti-FLAG M2 affinity column ("Mammalian Transient Expression System", Sigma-Aldrich Co., St. Louis, MO) The column profile was analyzed via SDS-PAGE and Western Blot using anti-FLAG M2 monoclonal antibody B Expression in SF9 insect cells
  • the human Beer gene sequence was amplified using PCR with standard conditions and the following primers Sense primer 5'-GTCGTCGGATCCATGGGGTGGCAGGCGTTCAAGAATGAT-3' (SEQ ID NO 26)
  • the resulting cDNA contained the coding region of Beer with two modifications
  • the N-terminal secretion signal was removed and a FLAG epitope tag (Sigma) was fused in frame to the C-terminal end of the insert BamHl and Hindlll cloning sites were added and the gene was subcloned into pMelBac vector (Invitrogen) for transfer into a baculoviral expression vector using standard methods
  • SF9 cells (Invitrogen) were maintained in TNM FH media (Invitrogen) containing 10% fetal calf serum
  • TNM FH media Invitrogen
  • SF9 cultures in spinner flasks were infected at an MOI of greater than 10 Samples of the media and cells were taken daily for five days, and Beer expression monitored by western blot using an anti-FLAG M2 monoclonal antibody (Sigma) or an anti-Beer rabbit polyclonal antiserum
  • the baculovirus-infected SF9 cells were harvested by cent ⁇ fugation and cell associated protein was extracted from the cell pellet using a high salt extraction buffer (1 5 M NaCl, 50 mM Tris pH 7 5)
  • the extract (20 ml per 300 ml culture) was clarified by cent ⁇ fugation, dialyzed three times against four liters of Tris buffered saline (150 mM NaCl, 50 mM T ⁇ s pH 7 5), and clarified by cent ⁇ fugation again
  • This high salt fraction was applied to Hitrap Hepa ⁇ n (Pharmacia, 5 ml bed volume), washed extensively with HEPES buffered saline (25 mM HEPES 7 5, 150 mM Nacl) and bound proteins were eluted with a gradient from 150 mM NaCl to 1200 mM NaCl Beer elution was observed at aproximately 800 mM NaCl Beer containing fractions were supplemented to 10% g
  • the E. co// ' -derived Beer protein was recovered in significant quantity using solubilization in 6M guanidine and dialyzed to 2-4M to prevent precipitation during storage
  • Gremlin and Dan protein were recovered in higher quantity with solubilization in 6M guanidine and a post purification guanidine concentration of 0 5M
  • Rabbit antisera and chicken egg Igy fraction were screened for activity via Western blot Each of the three antigens was separated by PAGE and transferred to
  • nitrocellulose strips of Beer, Gremlin or Dan were incubated with dilutions (1 5000 and 1 10,000) of their respective rabbit antisera or chicken egg IgY as well as to antisera or chicken egg Igy (dilutions 1 1000 and 1 5000) made to the remaining two antigens
  • dilutions 1 5000 and 1 10,000 of their respective rabbit antisera or chicken egg IgY as well as to antisera or chicken egg Igy (dilutions 1 1000 and 1 5000) made to the remaining two antigens
  • the increased levels of nonmatching antibodies was performed to detect low affinity binding by those antibodies that may be seen only at increased concentration
  • the protocol and duration of development is the same for all three binding events using the protocol described above There was no antigen cross-reactivity observed for any of the antigens tested
  • TGF ⁇ -1, TGF ⁇ -2, TGF ⁇ -3, BMP-4, BMP-5, BMP-6 and GDNF were obtained from comme ⁇ cal sources (R&D systems, Minneapolis, MN)
  • a representative protocol is as follows Partially purified Beer was dialyzed into HEPES buffered saline (25 M HEPES 7 5, 150 mM NaCl) Immunoprecipitations were done in 300 ul of IP buffer (150 mM NaCl, 25 mM T ⁇ s pH 7 5, ImM EDTA, 1 4 mM ⁇ -mercaptoethanol, 0 5 % t ⁇ ton X 100, and 10% glycerol) 30 ng recombinant human BMP-5 protein (R&D systems) was applied to 15 ul of FLAG affinity matrix (Sigma, St Louis MO)) in the presence and absence of 500 ng FLAG epitope-tagged
  • Beer is engineered and expressed as a human Fc fusion protein
  • ligand BMP is engineered and expressed as mouse Fc fusion
  • BMP concentration is held fixed at the Kd determined previously.
  • a collection of antagonist candidates is added at a fixed concentration (20 uM in the case of the small organic molecule collections and 1 uM in antibody studies)
  • candidate molecules (antagonists) of TGF-beta binding-protein binding include organic compounds derived from commercial or internal collections representing diverse chemical structures These compounds are prepared as stock solutions in DMSO and are added to assay wells at ⁇ 1% of final volume under the standard assay conditions These are incubated for 2 hours at room temperature with the BMP and Beer, the solution removed and the bound BMP is quantitated as described Agents that inhibit 40%) of the BMP binding observed in the absence of compound or antibody are considered antagonists of this interaction These are further evaluated as potential inhibitors based on titration studies to determine their inhibition constants and their influence on TGF-beta binding-protein binding affinity Comparable specificity control assays may also be conducted to establish the selectivity profile for the identified antagonist through studies using assays dependent on the BMP ligand action (e g
  • TGF-beta binding-protein 1 D I-labelled TGF-beta binding-protein is prepared as described by Nicolas (supra) Hydroxyapatite is added to each well of a 96 well microtiter plate equipped with a polypropylene filtration membrane (Polyfiltroninc, Weymouth MA) TGF-beta binding-protein is added to 0 2%o albumin in PBS buffer The wells containing matrix are washed 3 times with this buffer Adsorbed TGF-beta binding-protein is eluted using 0 3M NaOH and quantitated Inhibitor identification is conducted via incubation of TGF-beta binding- protein with test molecules and applying the mixture to the matrix as described above The matrix is washed 3 times with 0 2% albumin in PBS buffer Adsorbed TGF-beta binding-protein is e
  • TGF-beta binding-protein cDNA in pBluescript SK serves as a template for mutagenesis
  • appropriate primers are utilized to generate the DNA fragment by polymerase chain reaction using Vent DNA polymerase (New England Biolabs, Beverly, MA)
  • the polymerase chain reaction is run for 23 cycles in buffers provided by the manufacturer using a 57°C annealing temperature
  • the product is then exposed to two restriction enzymes and after isolation using agarose gel electrophoresis, ligated back into pRBP4- 503 from which the matching sequence has been removed by enzymatic digestion Integrity of the mutant is verified by DNA sequencing
  • mutant TGF-beta binding-protein cDNAs are transferred into the pcDNA3 1 mammalian expression vector described in EXAMPLE 3 After verifying the sequence, the resultant constructs are transfected into COS-1 cells, and secreted protein is purified as described in EXAMPLE 3
  • the presence of the transgene was ascertained by performing Southern blot analysis of genomic DNA extracted from a small amount of mouse tissue, such as the tip of a tail DNA was extracted using the following protocol tissue was digested overnight at 55° C in a lysis buffer containing 200 mM NaCl, 100 mM Tris pH8 5, 5 mM EDTA, 0 2% SDS and 0 5 mg/ml Proteinase K The following day, the DNA was extracted once with phenol/chloroform (50 50), once with chloroform/isoamylalcohol (24 1) and precipitated with ethanol Upon resuspension in TE (lOmM Tris pH7 5, 1 mM EDTA) 8-10 ug of each DNA sample were digested with a restriction endonuclease, such as EcoRI, subjected to gel electrophoresis and transferred to a charged nylon membrane, such as HyBondN+ (Amersham, Arlington Heights, IL ) The resulting filter
  • ES cells Homologous recombination in embryonic stem (ES) cells can be used to inactivate the endogenous mouse Beer gene and subsequently generate animals carrying the loss-of-function mutation
  • a reporter gene such as the E coli ⁇ -galactosidase gene, was engineered into the targeting vector so that its expression is controlled by the endogenous Beer gene's promoter and translational initiation signal In this way, the spatial and temporal patterns of Beer gene expression can be determined in animals carrying a targeted allele
  • the targeting vector was constructed by first cloning the drug-selectable phosphoglycerate kinase (PGK) promoter driven neomycin-resistance gene (neo) cassette from pGT-N29 (New England Biolabs, Beverly, MA) into the cloning vector pSP72 (Promega, Madson, WI) PCR was used to flank the PGK/7eo cassette with bacteriophage PI loxP sites, which are recognition sites for the PI Cre recombinase (Hoess et al , PNAS USA, 79 3398, 1982) This allows subsequent removal of the neo- resistance marker in targeted ES cells or ES cell-derived animals (US Patent 4,959,317)
  • the PCR primers were comprised of the 34 nucleotide (ntd) loxP sequence, 15-25 ntd complementary to the 5' and 3' ends of the PGKneo cassette, as well as restriction enzyme recognition sites (Bam
  • the next step was to clone a 3 6 kb Xhol-Hindlll fragment, containing the E. coli ⁇ -galactosidase gene and SV40 polyadenylation signal from pSV ⁇ (Clontech, Palo Alto, CA) into the pSP72-PGKneo plasmid
  • the "short arm" of homology from the mouse Beer gene locus was generated by amplifying a 2 4 kb fragment from the BAC clone 15G5
  • the 3' end of the fragment coincided with the translational initiation site of the Beer gene, and the anti-sense primer used in the PCR also included 30 ntd complementary to the 5' end of the ⁇ -galacto id se gene so that its coding region could be fused to the Beer initiation site in-frame
  • the approach taken for introducing the "short arm" into the pSP72- ⁇ gal-PGKneo plasmid was to linearize the plasmid at
  • the "long arm" from the Beer gene locus was generated by amplifying a 6 1 kb fragment from BAC clone 15G5 with primers which also introduce the rare- cutting restriction enzyme sites SgrAI, Fsel, Ascl and Pad Specifically, the sequence of the sense primer was 5'-ATTACCACCGGTGACACCCGCTTCCTGACAG-3' (SEQ ID NO 38), the sequence of the anti-sense primer was 5'- ATTACTTAATTAAACATGGCGCGCCAT
  • the resulting PCR product was cloned into the TA vector (Invitrogen, Carlsbad, CA ) as an intermediate step
  • the mouse Beer gene targeting construct also included a second selectable marker, the herpes simplex vn us I thymidine kinase gene (HSVTK) under the control of rous sarcoma virus long terminal repeat element (RSV LTR) Expression of this gene renders mammalian cells sensitive (and inviable) to gancyclovir, it is therefore a convenient way to select against neomycm-resistant cells in which the construct has integrated by a non-homologous event (US Patent 5,464,764)
  • the RSVLTR-HSVTK cassette was amplified from pPS 1337 using primers that allow subsequent cloning into the Fsel and Ascl sites of the "long arm"-TA vector plasmid For this PCR, the sequence of the
  • the final step in the construction of the targeting vector involved cloning the 8 8 kb SgrAI-AscI fragment containing the "long arm” and RSVLTR- HSVTK gene into the SgrAI and Ascl sites of the pSP72-"short arm"- ⁇ gal-PGKneo plasmid
  • This targeting vector was linearized by digestion with either Ascl or Pad before electroporation into ES cells
  • 17-nucleot ⁇ de antisense oligonucleotides are prepared in an overlapping format, in such a way that the 5' end of the first oligonucleotide overlaps the translation initiating AUG of the Beer transcript, and the 5' ends of successive oligonucleotides occur in 5 nucleotide increments moving in the 5' direction (up to 50 nucleotides away), relative to the Beer AUG
  • responding control oligonucleotides are designed and prepared using equivalent base composition but redistributed in sequence to inhibit any significant hybridization to the coding mRNA
  • Reagent delivery to the test cellular system is conducted through cationic lipid delivery (P L Feigner, Proc Natl Acad Sci USA 84 1413, 1987) 2 ug of antisense oligonucleotide is added to 100 ul of reduced serum media (Opti-MEM I reduced serum media, Life Technologies, Gaithersburg MD) and this is mixed with Lipofectin reagent (6 ul
  • Sequence ID No. 1 Human BEER cDNA (complete coding region plus 5 ' and 3' UTRs)
  • GGGCrGTGGCGC L _-3C arophy CCGGT_aGCGaGCTL-,GT ⁇ J T ,CTC ,G complicatL- GT .C., ⁇ CCCGGC -TC..._,CT -, TL r L, ⁇ -_PC caTrGGCGGCuG3 _BGTL-,G ⁇ G C& cCTaGT&G ⁇ J CC3_aGT r ⁇ , CC&C r ⁇ , L ⁇ 2""" JCCC ⁇ .
  • Sequence ID No. 10 Vervet BEER protein (complete sequence) » QL r AL c -3 _3Hr E A INF. -A IG -A a i FEA F AE A RELHFTRi "3 A ⁇ R3Ar R - wwlRr 5" " ⁇ FROI ⁇ ER i fAQR ⁇ ⁇ - ⁇ ,-,- - • f R-. RA R L yacGE T RLTP FH'.GV EL 1 DFGFE A REQrARr'FR ⁇ R-R --- a tIQ"E ⁇ _Z ⁇ a v -
  • Sequence ID No. 12 Mouse BEER protein (complete sequence)
  • Sequence ID No. 16 Bovine BEER protein (partial sequence -- missing signal sequence and last 6 residues)
  • G B GTcacaGGGTCaGCCTCCaGCTCaG CGCTGCaT B 3TC , 'T E GGGa 3C m 3Tf C3aG m CCTCCCTacCTCAACTBTCC" aGBAG3CB&GL,L,GCTTuGCGCTCTCaG3/ 1 CCCTGCTT JCT3 TTTTaTCTCr B G T D GGTTGCCT B L Gca aGTGTCaGCaCTGaTGGCTGCCTTGGaGAACac B ⁇ CTTTGCCCTGTBTuCa ATCTGacCTTGac n TGGGG&r
  • GCTGCTC B GCTGGGaGGaTC B CTGCaT B CCTaA &CCa GCCTA, B CC' ⁇ , "'CTT3GTCCacCTGa ' " TCCTGLACCAAG
  • GGGaGGTGGGGGCaGaGCCTTGC B GCTCTTTCCTCCCaTCTGG B CaGC_C ⁇ cTGGCTCBGCaGCCCaT B TG GCaC GGC ac ⁇ TCCCC B CCCCacCCCCacCTT CCTGTCCTGC B G B ATTT B GGCTCTCT ⁇ BCCGGGGGGGGGGGGGGCAGTCC TaTCCTCTCTT B GGTBG CBGG B CTCTGCaGGaG B C B CTGCTTTGTa GaT B CTGCBGTTTB TTTG aTGTTGTGaGG
  • TTCTTCacCCaGTC B CCG B C B TTTaTTC G accTa ⁇ CCCLAa_ 3 GaGG3 B CCGT : ⁇ GCaGGTACTG GGC CC acC a CT
  • a GGTT a- ⁇ T"-GG C-TG- ⁇ T G CaGGaai ⁇ a GT ⁇ a GCaC'-"-a-' , -TG ' — - ⁇ r ⁇ mr j-,,, ⁇ - ⁇ . ⁇ ,,, ⁇ . ⁇ . ⁇ , ⁇ , ⁇ . ⁇ .. ⁇ . ⁇
  • B A,GATGGAA.CATCAAoa.GGTC.
  • B A.CCT3 TTGTCTCCACACAC
  • C aAoATACACACA7GCACATACATCCACACACAGG3.aAACACATGCACACACCTGAACACCCTCCA
  • B GATAoa usuallyAGACACACACTAC, B AoAGTC B .CCGTGGG B .CCAGTTTATTCACCCACCCACCCCTGCTTCTGTTCATCCG3CCAGCT .aAGTAGTCCAA.CCTCTCTGGTGCTGTACCCTGGACCCTGGCTTCACCACAGCTCCTCCATGCTACCCAGCCCTGC.AAACC
  • TTCAGCCTAGCCTCTGGTTCTCC BA.CCAGCACAGGCCCAGTCTGGCTTCTATGTCCTAGAA
  • B A TCTACCACCTTCT77CTCCCTTC7CC7GACCTCTAo a .TGTCTTGGTCAAoACGATTACAoAGG.
  • B A.GCCAA. TGAAo B TTAGCAGTTTGGGGTACCTCAGAGTCAGCAG3GGAGCTGGGATGAA.TTCACATTTCCAGGCCT7TGCTTTGCTCC CCGGATTCTGACAGGCAGTTCCG
  • B A.GCTGAGTCCAGGAoAGCTGAoATTT B A.GCTGAGTCCAGGAoAGCTGAoATTT.
  • ATAGTTACTGTC B AAA,GTAA.TTCT.
  • E TTT TACA,CCCT7ATACATGGT A ,TTGCTTTTGTTGGA.G B .CTCT, A N N A TCCAG BT 7 ATGTATTTAAAA?AAAA.TTCCCCA.GTCCTTAAAA , GGTGAA.GAA.TGGACCC.AGATAGAAGGTCACGGCACAA.GTATGG.AGT CGGAGTGTGGAGTCCTGCCAATGGTGTGGACAGAAGCATCCAGAGAGGGTCCAAGACAAATGCCTCGCCTCCTAAGGAAC
  • Sequence ID No. 18 Human Beer Genomic Sequence (This gene has two exons, at positions 161-427 a d 3186-5219) .

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Abstract

L'invention concerne une nouvelle classe ou famille de protéines de liaison du TGF-β. L'invention concerne également des dosages de sélection de molécules permettant d'augmenter la minéralisation de la substance osseuse et des méthodes d'utilisation de ces molécules.
PCT/US1999/027990 1998-11-27 1999-11-24 Compositions et methodes d'augmentation de la mineralisation de la substance osseuse WO2000032773A1 (fr)

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CN99815505.5A CN1333828B (zh) 1998-11-27 1999-11-24 增加骨矿化的组合物和方法
EP99963986.7A EP1133558B2 (fr) 1998-11-27 1999-11-24 Compositions et methodes d'augmentation de la mineralisation de la substance osseuse
ES99963986.7T ES2272093T5 (es) 1998-11-27 1999-11-24 Composiciones y métodos para incrementar la mineralización de la substancia ósea
CA2352532A CA2352532C (fr) 1998-11-27 1999-11-24 Compositions et methodes d'augmentation de la mineralisation de la substance osseuse
BRPI9915679A BRPI9915679B8 (pt) 1998-11-27 1999-11-24 composições e métodos para aumentar a mineralização óssea
HK02105515.3A HK1044171B (zh) 1998-11-27 1999-11-24 增加骨矿化的组合物和方法
NZ512122A NZ512122A (en) 1998-11-27 1999-11-24 Compositions and methods for increasing bone mineralization
IL14326699A IL143266A0 (en) 1998-11-27 1999-11-24 Transforming growth factor-beta binding proteins and pharmaceutical compositions for increasing bone mineral content utilizing the same
JP2000585404A JP4813660B2 (ja) 1998-11-27 1999-11-24 骨鉱化作用を増加するための組成物および方法
MX2013001685A MX343200B (es) 1998-11-27 1999-11-24 Composiciones y metodos para aumentar la mineralizacion ósea.
AU20313/00A AU2031300C1 (en) 1998-11-27 1999-11-24 Compositions and methods for increasing bone mineralization
DK99963986.7T DK1133558T4 (en) 1998-11-27 1999-11-24 Compositions and methods for increasing bone mineralization
DE69933044.0T DE69933044T3 (de) 1998-11-27 1999-11-24 Zusammensetzungen und verfahren zur erhöhung der knochenmineralisierung
MXPA01005275A MXPA01005275A (es) 1998-11-27 1999-11-24 Composiciones y metodos para aumentar la mineralizacion de huesos.
IL143266A IL143266A (en) 1998-11-27 2001-05-21 Antibodies that bind β – TGF-binding proteins with a 1– M 6 10 strain and their use
CY20061101623T CY1106260T1 (el) 1998-11-27 2006-11-09 Συνθεσεις και μεθοδοι για την αυξηση της ασβεστοποιησεως των οστων
IL210392A IL210392A (en) 1998-11-27 2010-12-30 A nucleic acid molecule that encodes a polypeptide that reduces bone mineral content

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